We are a brother and a sister. Then, we are...
Siblings
I am your uncles' son. Who am I?
Cousin
I am married to you. Who am I?
Husband/Wife
I have a partner, but we are not married yet. What is he?
Boyfriend
Who is she?
Grandma / grandmother
I am Dixie. Who are my grandparents?
They are: Regina, Ken, Laura and John
I am Adam. Who is my sister-in-law?
She is Eva
I am Charlie. Who are my cousins?
They are Jonas and George.
Who is my mother's son?
Brother
I am Eva. Who is my husband?
He is Tomas
I am your sister's daughter. Who am I?
Niece
You are our son/daughter. Who are we?
Parents
Who am I to my grandparents?
You are their Granddaughter / grandson (grandsons)
I am Jonas. Who are my uncles?
They are Eva and Thomas.
I am Addison. Who are my siblings?
They are Dixie and Charlie
I am not dating my husband/wife anymore. What am I now?
You are his Ex
Who is my father' sister?
Aunt
I am your brother's son. Who am I?
Nephew