A brother or sister who was born at the same time as you.
twin
Your wife's or husband's mother.
mother-in-law
You dad's brother.
uncle
Your sister's or brother's daughter.
niece
Your dad's second wife.
step-mother
Your sister's or brother's son.
nephew
It's you mom's mom.
grandmother
Your grandparents' parents.
great-grandparents.
The child from your father's or mother's second relationship.
half-brother/sister
Your mom's sister.
aunt
Your dad's wife.
mother
It's your bother's sister.
sister
They are your uncle's or aunt's chiildren.
cousins
Your wife's or husband's father.
Father-in-law
Your mother's second husband.
step-father
The man or woman who you are divorced/separated from.
ex-husband/ ex-wife