Your uncle's son is your...
primo
The father of your father is your...
abuelo
Your father's mother is your...
abuela
Your brother's mother is your...
madre
Your wife's son is your...
hijo
Your aunt's children are your...
primos
You are my son. I am your…
padre
Your mother is my mum. Your father is my dad. I'm your…
hermano/a
The sister of your mother is your...
tia
The daughter of your grandparents and wife of your father is your...
madre
Your sister's daughter is your...
sobrina
You are the son of my son. You are my…
nieto
Your mother's husband is your...
padre
Your sister's brother is your...
hermano
Your father's brother is your...
tio
Your father's mother or father is your...
abuelo/a
My mum and your mum are sisters. I am your…
primo/a