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