Have you considered the fact Dick is playing mind games both with you and your son? The motorcyle comments could be a button pushing mechanism to get you riled up or make your son jealous. Don't buy into anything he's saying right now. He's doing exactly what I thought he would. His tactics are changing...he's playing one child against the other for his attention....not good.
Listen, but let it go. Your son needs to listen and let it go. He's playing head games.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.