"A house, I think. The room was big and empty."

If it was a ship, he had a feeling he wouldn't have been waiting for his father to come back.

"I remember a lot of yelling, a lot of nightmares... A lot of droids..." Someone, or rather something, had to look after a young Ben when Han was away and Leia was tending to political matters. "Definitely a lot of droids once I started figuring out the Force. The voice... Snoke... said it was because everyone was afraid of me. And that they should be."

He remembered that last part very clearly.