I'd show them the OOT, and if they really liked those maybe I'd show them the PT one day. Actually I'd probably just show them TPM. But I don't think there will really be any moment where I'll sit them down and "unveil" the films, I watch them regularly so they will probably just grow up with them. That was how it was with me; I have no memory of first watching ANH because I was under two years old, its just kind of "always" been there. The only film I might go out of my way to play for them is TPM because I think thats a really good film for young kids but I doubt I'd watch it a whole lot myself.