This question already has an answer here:
If we would specify "Onkel", "Tante" or "Cousin(e)" related through the mother's side of the family, can we use:
mein mütterlicher Onkel
meine mütterliche Tante
meine mütterliche Cousine
because "Onkel", for example, may mean "brother of mother or father".
Is that correct for Germans?