First-cousin marriage has been legal in the UK since the 16th century. A private member's bill to prohibit it, introduced in 2026 by Dr Luke Evans, is scheduled for second reading in January 2027. Children of first cousins face roughly double the risk of birth defects compared with unrelated parents, prompting public health concerns especially in communities where the practice is more common.
Children’s health carried the room, with Yes winning by nearly nine to one. For a self-selected online vote, it was an unusually emphatic verdict — but the arguments showed a sharper divide over the means than the end.
The argument the floor rated highest called first-cousin marriage “a backward, medieval practice”, while the next-strongest Yes case pressed the public-health analogy: “it would have been banned as a matter of course decades ago”. Other Yes voters linked the practice to inherited wealth, clan alliances and pressure on the NHS, though some drifted into sweeping and openly contemptuous claims about particular communities.
No voters did not generally dispute the health concern; their case was about liberty, enforcement and unintended consequences. The floor’s most-respected No voice warned that “criminalising consenting adults will drive ceremonies underground”, arguing instead for “expanding NHS preconception genetic screening and community education”, while another said the issue remained with the couple: “it’s the couple who have to choose”.
That was the debate’s central mismatch: Yes treated the risk to children as sufficient grounds for the state to intervene, while No treated criminalisation as a blunt instrument that could weaken legal protections and prove impossible to enforce. A more measured Yes argument framed marriage as a way to “strengthen social alliances and retain wealth and property within a family bloodline”; at the edges, some comments turned to moral condemnation, while one No intervention made the issue about immigration and remigration rather than consent or health.
The room was clear about the risk it wanted addressed, but much less united on what a ban would actually do.
“A backward, medieval practice that only persists amongst backward, medieval cultures.”
YES case · Jonathan · 8 respects · read the thread ↓
“This is a really hard one. One the surface it's easy to immediately say "yes ban them" but the practical reality is that criminalising consenting adults will drive ceremonies underground, thus stripping women of civil legal protections. I think education has an extremely vital part to play, and the solution is expanding NHS preconception genetic screening and community education, giving families i”
NO case · BenL · 2 respects · read the thread ↓
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Every vote you cast builds your political profile — where you lean, worked out from real questions rather than fixed statements.
13 Opinions
We never needed to ban it before mass immigration. If we commence massive remigration then there is no problem with it.
Difficult because while its legal for first cousins to marry, there is a large risk of any children they may have, being born with disabilities/deformatives. Nobody wants to have children with problems. They would need to decide if it's worth the risk, could they care for such a child, and what happens when they, as parents pass away? I'm on the fence, as it's the couple who have to choose, it's an extremely personal decision. All the information must be available to them.
Yes, anybody who wants to support this nonsense is sick.
Causes more disabilities than non cousin children. Percentage wise
Voted no but only because I don’t liking banning things and it’s impossible to implement.. what would we do imprison them ? Not practical .. and where would our royal family have been without it haha
First cousin marriages has been a human strategy intended to strengthen social alliances and retain wealth and property within a family bloodline e.g. royal families. The genetic hazards have always been known but the science has caught up to provide the direct proof that this practice is no longer tolerable. Where religious practices are the primary driver then the religion must address the issue directly and ban it.
Practiced predominately by one sector of the community that also considers itself above the law in many other areas continually seeking, sometimes violently, special treatment. Issue is birth defects & IQ levels. If a native Englishman procreated with their cousin there probably would not be an issue, however where the entire family line for generations is inbred to hoard wealth & for tribal control there will be problems. We don’t need low IQ medieval practices in UK.
The risks of genetic defects, and other health problems almost doubles in cultures that use this to preserve family wealth and clan alliances. Among British Pakistanis 35-55% of marriages are among cousins, which across generation increases the risk and the burden on the NHS. It is also is used to bypass immigration controls and prevent integration. Norway has already banned it as have many US states, and Sweden plans to this year.
If there was a chemical that caused the kind of birth defects at the rate that happens to the offspring of these marriages it would have been banned as a matter of course decades ago.
A backward, medieval practice that only persists amongst backward, medieval cultures.