Ответ:

  1. My mum's son is my brother.
  2. My dad's brother is my uncle.
  3. My mum's father and mother are my grandparents.
  4. My parents' daughter is my sister.
  5. My father's father is my grandfather.
  6. My father's sister's children are my cousins.
  7. My brother's daughter is my niece.
  8. My daughter's daughter is my granddaughter.
  9. My sister's son is my nephew.