Mandy, I agree w/forward...the mlcer wants someone to look up to them and put them on a pedestal. They also want to be able to say that they helped the individuals who need assistance. Keep in mind, the mlcer doesn't want to be judged by his own flesh and blood, i.e., children. Children have a history w/the mlcers and the mlcers know this and do not want to be put on notice whenever the children require their time or assistance.
Mandy, this is very typical of mlcers. I am sorry to hear that he is doing this. There will come a time when your son will have his say, but it may be several years down the road. Hopefully by that time, your son's father will be ready to listen.
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.