A brother or sister who was born at the same time as you
twin
Your brother’s sister's daughter
niece
Your aunt’s or uncle’s children
cousin
Your grandparents’ parents
great-grandparents
The man or woman who you are divorced/separated from
ex-husband/ex-wife
Your children’s children
grandson / granddaughter
your father’s second wife
stepmother
Your parents’ parents
grandfather/ grandmother/ grandparents
Your brother’s sister's son
nephew
Your parents’ brother
uncle
Your wife’s or husband’s mother
mother-in-law
Your parents’ sister
aunt
Your wife’s or husband’s brother
brother-in-law