Information needed about unreal code.

I’ve been reading reading some books on code, and I have one more left on templates and meta programming. I’m having a finding waldo dilemma inside the unreal engine documentation. I’m browsing through the apawn class And I see that Fvector is class for returns is used inside. The thing Is I don’t see where Aactor inherits from Fvector and when I check the other inheritance It turns up a empty page. I just want to know how these different classes or linking together.