Cryptic, so that they can't be called on their absolute bullshit.

"That... probably doesn't make a lot of sense to you. Back home, I have at least three dead Jedi Masters who routinely turn up to give me advice I don't want. It makes me look a little crazy, because no one else seems to be able to see them."

It's mostly Ben. Yoda mostly turns up to tell him what he's doing wrong. He's seen Anakin a few times, but his father is... shy? Ashamed? He isn't sure. Once, he swears he saw someone else, a man with long, flowing hair who watched from a distance.