Men cannot marry:- | | | | Grandmother Mother mother’s sister mother’s half-sister father’s sister father’s half-sister adoptive mother - Sister half-sister Daughter adopted daughter - sister’s daughter half-sister’s daughter brother’s daughter half-brother’s daughter Granddaughter | | Women cannot marry:- | | | | Grandfather Father father’s brother father’s half-brother mother’s brother mother’s half-brother adoptive father - see below Brother half-brother Son adopted son - see below sister’s son half-sister’s son brother’s son half-brother’s son Grandson | |
Adopted children and their genetic parents and genetic grandparents may not marry. If they do, the marriage will be automatically void (see under heading Marriages which are not valid ) even if they do not know they are related. Adopted children may not marry their adoptive parents but they are allowed to marry the rest of their adoptive family, including their adoptive brother or sister.
People who are step relations or in-laws may marry only in certain circumstances.
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