Final answer:
The linking verb in the sentence is 'were' and the predicate noun is 'delegates'
Step-by-step explanation:
The linking verb in this sentence is 'were' and the predicate noun is 'delegates'.
A linking verb connects the subject of a sentence to a noun or adjective that renames or describes it. In this case, 'were' connects the subject 'My parents' with the noun 'delegates', which renames or describes them.
Learn more about Linking verbs and predicate nouns