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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 .
Relative pronouns: who. We use who in relative clauses to refer to people, and sometimes to pet animals. We use it to introduce defining and non-defining relative clauses: I think thereâd be a lot of children whoâd love to have a climbing wall in school.