You know he's nuts and he's a whiner that loves to whine and cry "poor me". So, here's what I would do....I would do nothing. Tell your kids the truth and let it go. Why? Because no matter what you say or do, he's still going to whine about something you have or have not done. Remember, they not only love positive attention, but negative too. The more you ignore him, the better and that doesn't feed him the ego kibbles he needs.
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.
