Summary: Labour has been accused by Conservatives of “turning a blind eye” to first-cousin marriage after a scheduled Commons stage for a Private Member’s Bill was delayed, leaving the proposal stalled. Ministers say marriage law remains under review, while supporters of a ban cite health and safeguarding concerns and critics warn against stigma and unintended community impacts.

Bill to ban first-cousin marriage left stalled after Commons timetable change

A cross-party row has flared after the Marriages (Prohibited Degrees of Relationship) Bill failed to make progress on its planned second reading date.

The legislation, promoted by Conservative MP Richard Holden, seeks to prohibit marriages between first cousins by changing the “prohibited degrees” in English and Welsh marriage law.

The latest delay followed a change to parliamentary sitting expectations on January 9, meaning the Commons did not reach the scheduled stage and the Bill remained blocked.

The pause extends a long-running pattern affecting many Private Members’ Bills, which depend heavily on limited debating time and the availability of Fridays for second readings.

Conservatives accuse Labour of blocking a ban and “hiding” its position

Holden has argued that Labour could enable progress by allocating government time or providing a so-called “guillotined” slot, which would restrict debate and force a decision.

He has also claimed Labour has refused to back the Bill politically, framing the lack of parliamentary time as evidence of reluctance to act.

“If you don’t back first-cousin marriage, you can just say so.”

“But Labour do back first cousin marriage and they’re trying to hide their secretive support for the practice.”

Labour ministers, however, have pointed to wider “review” work on marriage law rather than committing to Holden’s specific proposal.

The dispute sits against a broader Westminster reality: without government backing, most Private Members’ Bills struggle to reach a vote, especially when they sit lower down the order paper.

Starmer previously declined to whip Labour MPs in support

The issue has surfaced repeatedly at Prime Minister’s Questions and in ministerial statements, with Holden previously urging Downing Street to direct Labour MPs to support his proposed ban.

Sir Keir Starmer has indicated the Government has a settled stance on Holden’s Bill, without setting out a detailed alternative legislative route.

“We’ve taken our position on that Bill, thank you.”

That response has become a focal point for Conservative criticism, with opponents portraying it as a refusal to confront health and safeguarding concerns raised by campaigners.

Supporters of Labour’s approach argue the topic sits within a complicated area of marriage law and safeguarding policy that may require a broader package than a single-issue ban.

Labour voices split as some MPs back a ban

While the Government has not adopted Holden’s Bill, Labour MP Neil Coyle has publicly supported banning first-cousin marriage, citing health risks as a justification.

“The prevalence of infant mortality and birth defects alone warrants the ban.”

The split illustrates the political tightrope for Labour: balancing public-health arguments with concerns about stigma, community relations, and enforcement challenges.

It also highlights a recurring theme in social-policy debates: whether Parliament should legislate through criminalisation and prohibition, or pursue public health messaging and safeguarding interventions.

Health arguments centre on genetic risk and outcomes for children

Advocates of a ban point to research and clinical concerns that children of first-cousin couples face higher risks of certain inherited disorders.

They argue that the policy aim is harm reduction rather than cultural judgement, and that clarity in law would help professionals address exploitative or pressured marriages.

Wes Streeting, the Health Secretary, has criticised past NHS guidance that was seen as too permissive, saying the health risks should not be minimised.

“First-cousin marriages are high risk and unsafe, we see the genetic defects it causes, the harm that it causes. That’s why that advice should never have been published.”

Critics of an outright ban, including some health and equality voices, warn that legislation could deter people from accessing healthcare support or genetic counselling if families fear judgement or legal consequences.

Critics warn against stigma as MPs debate culture, safeguarding and coercion

The politics around cousin marriage can quickly become heated, because it intersects with sensitive issues including coercion, safeguarding, disability outcomes, and community pressure.

Campaigners who oppose cousin marriage often argue that the practice can reinforce closed family structures and make it harder for vulnerable individuals, particularly younger people, to refuse a match.

Others argue that focusing on one form of marriage can unintentionally stigmatise communities, and that the state should target coercion and forced marriage directly regardless of relationship type.

In Parliament, pro-Gaza independent MP Iqbal Mohamed has argued against a ban, saying cousin marriage can strengthen family ties and financial stability for some families.

It remains “common” because it “helps to build family bonds and puts families on a more secure financial foothold”.

That argument has been rejected by MPs backing a ban, who say perceived social benefits do not outweigh health and safeguarding risks.

Polling and electoral sensitivities add pressure to an already fraught issue

The debate is also politically charged because it plays into wider arguments about Labour’s relationship with socially conservative voters and the party’s approach to sensitive cultural questions.

A YouGov poll referenced in reporting suggested varying levels of support for a ban across demographic groups, while also indicating majority support overall for prohibiting first-cousin marriage.

Labour’s opponents argue the party is reluctant to confront the topic because of electoral considerations in some constituencies with large minority communities.

Labour sources and supporters counter that responsible policymaking requires careful consideration of unintended impacts, particularly where a legal ban could drive practices underground.

Private Members’ Bill faces deadline pressure ahead of the next King’s Speech

Holden is under time pressure because Private Members’ Bills that do not progress can fall at the end of a session, requiring reintroduction from the start after the next King’s Speech.

That reality is central to the Conservative attack line: that without government time, the Bill is likely to keep drifting, regardless of stated concern from ministers.

Labour retains the ability to speed the Bill up if it chooses, either by backing it as government business or ensuring a clear route to a vote.

For now, ministers have signalled a preference to keep marriage law “under review”, leaving the policy question unresolved and the political argument very much alive.