It's odd and would either creep me out or make me laugh but I also wonder if the dad was really "spying" on his child and not necessarily the provider. Parents want to know what's going on when they aren't around and I think that's normal. Hiding behind a tree isn't normal to me lol but maybe there is no bad intent behind it?

I'd be so oblivious to him spying that I'd make contact assuming he's there to pick up lol