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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
We use both with a plural noun. both houses both of the houses Both (of) my brothers are tall. We use of before the pronouns us, you, them. both of us, both of you, either of them, neither of them, etc. Between of and a noun we use these, those or my, your, John's, etc., or the.both of those houses, neither of my brothers, both of John's sisters, either of the cinemas. See also: Correlative conjunctions: neither. . . nor, either. . . or, both.ne of the tricky things about either, neither and both is knowing if they should be followed by singular or plural nouns and verbs. The table below explains either, neither and both, and the rules for what should follow them.