Question

Which part of the sentence is a compound predicate ? rachel is my aunt and guardian

Answer 1

The predicate is the verb, or action word, and all the other modifiers in the sentence. A compound predicate occurs when the subject in the sentence is doing more than one action and is shared by two or more verbs. In this case the predicate is being both their; aunt and guardian. 

Answer 2

The answer would be aunt and guardian