I’ve stuck this in because there seems to be quite a lot of family marrying family. I think canon law is broadly similar in the Catholic Church, but this came to hand first.
The Book of Common Prayer
A TABLE OF KINDRED AND AFFINITY WHEREIN WHOSOEVER ARE RELATED ARE FORBIDDEN BY THE CHURCH OF ENGLAND TO MARRY TOGETHER.
A man may not marry his:
- Mother
- Daughter
- Father’s mother
- Mother’s mother
- Son’s daughter
- Daughter’s daughter
- Sister
- Father’s daughter
- Mother’s daughter
- Wife’s mother
- Wife’s daughter
- Father’s wife
- Son’s wife
- Father’s father’s wife
- Mother’s father’s wife
- Wife’s father’s mother
- Wife’s mother’s mother
- Wife’s son’s daughter
- Wife’s daughter’s daughter
- Son’s son’s wife
- Daughter’s son’s wife
- Father’s sister
- Mother’s sister
- Brother’s daughter
- Sister’s daughter
A woman may not marry her:
- Father
- Son
- Father’s father
- Mother’s father
- Son’s son
- Daughter’s son
- Brother
- Father’s son
- Mother’s son
- Husband’s father
- Husband’s son
- Mother’s husband
- Daughter’s husband
- Father’s mother’s husband
- Mother’s mother’s husband
- Husband’s father’s father
- Husband’s mother’s father
- Husband’s son’s son
- Husband’s daughter’s son
- Son’s daughter’s husband
- Daughter’s daughter’s husband
- Father’s brother
- Mother’s brother
- Brother’s son
- Sister’s son
