Animal Family

For collateral relatives, more classificatory terms come into play, terms that do not build on the terms used within the nuclear family:
• Uncle: father's brother, mother's brother, father's sister's husband, mother's sister's husband
• Aunt: father's sister, mother's sister, father's brother's wife, mother's brother's wife
• Nephew: sister's son, brother's son, wife's brother's son, wife's sister's son, husband's brother's son, husband's sister's son