MP calls for first-cousin marriage to be banned

Holden said that while the overall prevalence of first-cousin marriage was low in Western countries, certain diaspora communities, such as Irish travellers and British Pakistanis, had “extremely high rates” of 20-40%.

The MP for Basildon and Billericay cited research suggesting the child of first cousins carries around double the risk of inheriting a serious disorder compared to the child or unrelated people.

Holden also argued the practice threatened women’s freedom.

“Women and girls living under a clan mentality often know the scientific risks of first-cousin marriage, but make considered social and cultural calculations,” he told MPs.

“Strict honour codes, where expressions of individuality can be subject to social isolation, violence and even death in some cases, dominate thinking.”

He said first-cousin marriage was “not really conducive to modern British society”, adding: “It’s about more than one marriage. It’s about the values and foundations of our society and our democracy.”