Bea, Ignore the email. He is just rambling, but he's also fishing. He's trying to find out where your son is and if they are in ow's town. I think he was trying to impress you a bit about the royalties, i.e., hoping you would respond back. He may be clueless, but he also knows how to manipulate a conversation to try to get info.
Bea, enjoy your weekend.
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.