Andy Burnham is facing growing pressure to support legislation that would ban marriage between first cousins, as the issue returns to the centre of Britain’s political debate. Critics of the Government argue that ministers have spent too long avoiding a difficult and sensitive question, while supporters of reform say the debate should focus on health, individual freedom and the integrity of marriage law rather than political sensitivities.
The controversy intensified this week after Labour indicated that it is considering whether legislation would be the best way to address concerns surrounding first-cousin marriage. The Ministry of Justice has acknowledged that “serious concerns” have been raised and said the Government will examine whether legislation is the appropriate solution.
That represents a significant change in tone. Under the previous Labour government, calls for a ban were resisted, with ministers arguing that the issue was complex and required careful consideration. A parliamentary debate in 2025 highlighted both the potential health concerns and the sensitivity of attempting to regulate marriage between consenting adults.
Now, however, the Government faces another opportunity to decide whether the law should change.
A Private Member’s Bill introduced by Conservative MP Dr Luke Evans was formally presented in the House of Commons in June 2026. The proposal would prohibit marriage between first cousins and also includes provisions concerning civil partnerships and sexual relationships between first cousins. Its second reading is scheduled for January 15, 2027
Richard Holden, who previously attempted to introduce similar legislation, has urged Burnham to support the new Bill. He has accused Labour of being unwilling to confront the issue and argued that the Prime Minister now has an opportunity to change course.
The argument for reform is based partly on health concerns. First-cousin couples have a higher genetic risk of having children affected by certain inherited conditions than unrelated couples. The Government itself has acknowledged that the available evidence suggests an increased risk of congenital birth defects among children whose parents are first cousins.
That does not mean that every child born to first-cousin parents will experience health problems. Nor should families affected by genetic conditions be stigmatised. The issue is one of statistical risk and whether the state should respond to that risk through changes to marriage law.
Supporters of a ban argue that the potential health consequences justify intervention. They also point to concerns about repeated cousin marriage across generations, where inherited conditions may become more common within particular family networks.
But health is only one part of the argument.
Another concern raised by opponents of first-cousin marriage is the possibility of coercion. In some communities, marriages between relatives can form part of longstanding family traditions. Critics argue that, in certain circumstances, young people may face pressure to marry within an extended family even when they would prefer not to.
That does not mean that cousin marriages are inherently forced or abusive. Many couples enter such marriages voluntarily. Any responsible discussion must therefore distinguish between consensual relationships and cases involving coercion.
The principle of individual choice is one reason why banning first-cousin marriage is not a straightforward question.
Britain permits consenting adults to marry despite many forms of family or social difference. Changing the law would therefore require Parliament to justify why this particular relationship should be treated differently.
The Government’s own previous response recognised that the issue is legally and socially complex. Ministers argued that it should be considered carefully and in consultation with affected communities rather than through piecemeal legislation.
That caution is understandable. But critics say caution must not become indefinite delay.
The political pressure has also increased because of concerns about immigration. Recent reporting has highlighted a case involving a Sudanese migrant whose marriage to a first cousin became relevant to her ability to remain in Britain. Critics have argued that such cases demonstrate how marriage can intersect with immigration rules and potentially create routes around restrictions.
This part of the argument requires particular care. A single immigration case cannot establish that first-cousin marriage is generally being used to circumvent immigration controls. Immigration decisions involve complicated legal considerations, and each case must be assessed on its own facts.
Nevertheless, the possibility that marriage law could interact with immigration policy is a legitimate matter for Parliament to examine.
The broader question is whether Britain should continue to permit first-cousin marriage when several other countries have introduced restrictions. Supporters of a ban point to countries that have already taken action, arguing that Britain should not ignore evidence of potential health and social risks.
Opponents may respond that international comparisons are not enough to justify changing British law. Different countries have different legal traditions, family structures and cultural practices. What works in one jurisdiction may not necessarily be appropriate in another.
This is why the parliamentary process matters.
Rather than allowing the issue to be decided by headlines or political accusations, MPs should examine the medical evidence, legal implications and potential consequences for affected families. They should also consider whether alternative measures could address the concerns without imposing an outright ban.
For example, greater access to genetic counselling could help couples understand potential risks before having children. Better education about inherited conditions could also allow families to make informed decisions. Stronger protection against forced marriage would address concerns about coercion without necessarily criminalising consensual relationships.
A ban, however, would represent a much more fundamental intervention.
If Parliament eventually decides that first-cousin marriage should be prohibited, lawmakers would also need to determine how the law should apply to existing marriages, future relationships and people who are already engaged or planning to marry. Enforcement would have to be considered carefully as well.
These details matter because poorly designed legislation can create unintended consequences.
For Burnham, the political calculation is therefore difficult. Supporting a ban could satisfy critics who believe Labour has avoided the issue. It could also demonstrate that the new Government is willing to reconsider policies inherited from its predecessor.
But opposition to a ban could be defended on the grounds of personal liberty, legal complexity and the need for more evidence.
The Prime Minister cannot simply dismiss the debate by calling it culturally sensitive. Governments routinely legislate in areas involving cultural and religious practices when they believe there is sufficient evidence of harm. Equally, sensitivity should not be confused with weakness. Any new law must be based on evidence and applied fairly to everyone.
That final point is particularly important.
A ban should not be framed as a measure against one ethnic or religious community. First-cousin marriage exists in different populations and has a long history in several parts of the world. If Parliament concludes that it should be prohibited, the law would need to apply consistently regardless of a person’s ethnicity, religion or cultural background.
Such an approach would make the debate about a general principle rather than targeting a particular group.
There is also a need to avoid exaggerating prevalence. First-cousin marriages account for a small proportion of marriages across Britain overall, although they are considerably more common in some communities. That distinction is important because national statistics can conceal substantial differences between populations.
The Government should therefore publish the strongest evidence available before reaching a final conclusion.
For families, the issue is deeply personal. A law that prevents two consenting adults from marrying would represent a major restriction on individual choice. At the same time, families affected by inherited medical conditions may reasonably argue that society has a responsibility to acknowledge and reduce preventable risks.
Both perspectives deserve consideration.
The phrase “coward” used by political critics may make for a powerful headline, but it does not resolve the underlying issue. The Government should be judged on whether it examines the evidence honestly and reaches a defensible conclusion.
Burnham now has the opportunity to do exactly that.
Rather than simply accepting the position of the previous administration, he could engage directly with Dr Evans, other MPs, medical experts and affected communities. Cross-party discussions could help establish whether there is a workable consensus and whether legislation is genuinely the best response.
The Government has already indicated that it is willing to consider the question. The next step should therefore be a transparent examination of the evidence.
Britain needs a debate that is neither dismissive nor inflammatory. First-cousin marriage should not be treated as evidence of criminality, nor should legitimate concerns about genetic risks, coercion or the interaction with immigration law be ignored.
Ultimately, the question for Burnham is straightforward: does the evidence justify changing the law?
If ministers believe that it does, they should support legislation and explain precisely why. If they believe that it does not, they should publish the evidence behind that decision and explain what alternative measures will address the concerns.
What would be least satisfactory is another period of political hesitation in which the issue is repeatedly discussed but no clear decision is made.
The coming parliamentary debate provides an opportunity to settle the matter through evidence, scrutiny and democratic debate. For Andy Burnham, supporting or rejecting a ban will carry political consequences. But the more important responsibility is to ensure that whatever decision is reached protects individual rights, addresses genuine health concerns and applies equally to everyone.
That is a standard considerably more meaningful than whether the Prime Minister is willing to face accusations of being “cowardly”. The public deserves a serious answer to a serious question—and Parliament now has an opportunity to provide one.