Sorry don't know what happened to my post there.
Anyway Andy in 6.5 Good Grief called his Uncle Donald "son of a b..."
I don't care for anyone saying that it is just an expression because the bottom line is the "b...." refers to his grandmother.
People should be careful not to call someone they are related to as "son of a b..." as they might be referring to a relation like mother, grandmother, aunt etc.