your son's son
GRANDSON
your son's daughter
GRANDDAUGHTER
your parent's brother's child
COUSIN
your father's brother
UNCLE
Your partner's son
STEP-SON
Your brother's son
NEPHEW
somebody you know, but who is not your friend
ACQUAINTANCE
your sons and daughters are your...
CHILDREN
Your sister's daughter
NIECE
a person who belongs to your family is your...
RELATIVE
Your grandmother's mother
GREAT-GRANDMOTHER
Your partner's brother
BROTHER-IN-LAW
somebody who works in the same place as you
COLLEAGUE / WORKMATE
your father marries another woman and then has a daughter with her. That girl is your...
HALF-SISTER
a person (not part of your family) you share your flat with
FLATMATE / ROOMMATE
The man you are married to
HUSBAND
somebody who lives in the same area as you
NEIGHBOUR
Two people who are in a relationship are called a...
COUPLE
Your partner's mother
MOTHER-IN-LAW
your mother's sister
AUNT
general word that includes "brothers" and "sisters"
SIBLING
the boy/man you have a romantic relationship with
BOYFRIEND
The woman you are married to
WIFE