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HMRC internal manual

Claimant Compliance Manual

Undisclosed Partners: List of Prohibited Relationships - Marriage

Throughout the United Kingdom and Guernsey, Jersey and the Isle of Man, the law prohibits certain blood relatives, step relatives and relatives-in-law from getting married.

A man cannot marry his:

  • mother
  • adopted mother
  • former adoptive mother
  • daughter
  • adoptive daughter
  • former adoptive daughter
  • grandmother
  • granddaughter
  • sister
  • aunt
  • niece

A woman cannot marry her:

  • father
  • adopted father
  • former adoptive father
  • son
  • adoptive son
  • former adoptive son
  • grandfather
  • grandson
  • brother
  • uncle
  • nephew

Additionally, people cannot marry if:

  • either of them is aged less than 16, or
  • in a ‘step’ relationship, the younger person had, before reaching age 18:
  • lived in the same household as the older person, and/or

    • been treated as a child of the older person’s family, or
  • in an ‘in-law’ relationship:

    • either person involved is aged less than 21, and/or
    • any person originally involved in creating the ‘in-law’ relationship’ is still alive, for example we do not consider LTAHAW if a man lives in the same household as his daughter-in-law and the man’s son or wife is still alive.

If you are unsure whether the customer is in a prohibited relationship you should seek further advice via your TALLO from Technical Advice Line