I heard somewhere that cats don’t get jealous but that is very, very far from my experience. Chris, for example, is a very jealous cat. Whenever he sees Frankie on my lap, he has to be on my lap too. At first I thought he didn’t want me paying attention to other cats but now I think he doesn’t want Frankie to pay attention to me.
Floki doesn’t get on my lap very often but when he does Chris ignores him. This is either because Chris want’s Frankie to himself or it is because Frankie is an alpha like Chris and Chris needs to protect what is his.