Didn't say how long ago he died. If it was recent he's definitely still around. If it was more than a few months ago he can visit and still check in on you but he's not a ghost ghost. Anyways what you wanna do is get some of these bitches they're called dowsing rods and they're really good at talking to the dead. All you gotta do is ask questions and the deceased will respond. Set it up first by asking some obvious questions. "My name is Anon, cross the rods for no point them left for yes" keep doing that. Making sure its your dad though is gonna require a little bit of necromancy/seance though so just make a little altar with his picture, a candle, and an object he liked to get him there. If you're gonna use a different divination method dont use the ouijia board, a pendulum will work but just dont do the ouijia board that's the only spirit communication method that gives things direct access to the medium which is dangerous.