I haven't read all of the posts on this forum, only the first page so if this was addressed I'm sorry.
as the opposite side of this story (the step mom) i have ALL of these things said about me. none of them are true, however the child has realized that his mother yell at him and punishes him when he says good things about me, and praises him and rewards him when he says bad things about me.
So I have been accused of "Forcing him" to call me mom, bad talking his mother, and in general just being a horrible person who the child dislikes and can't stand being around.
Now, in my and the father's presence the child says he loves me and likes to call me mom sometimes. (Which he is allowed to if he wants) he also tells us terrible things about his own mother, including the fact that he never sees her.
(Which we believe, he lives with his grandparents and they have been claiming that the mother lives with them and the child, but most recently the grandmother posted to her facebook that the mother was going to be homeless and the grandfather won't let the mother stay with them... i thought she ALREADY WAS staying with them??? i guess not.)
I understand that if your child has eczema and they aren't treating it properly, that is very worrisome and should be addressed.
As the "evil stepmother" i also think that her goign to the school and claiming to be there biological mother is wrong, and trying to prevent you from going to the school is wrong, but he going to events for him (like concerts, sports events, boy scouts/girl scouts is not you should prevent. She may be a bad influence on the children but that doesn't mean she is any less their step mother.
I don't know you and i don't know your entire situation, but the mother of my step son posts stuff like this constantly and what she says about me is just not true. your children should probably go to real counseling and talk to someone who isn't a parent. often times kids say bad things about the other parent to get more attention from the parent they are with, i'm sorry but it is just a cold hard fact of life.
please have the kids go to a professional where they can voice their opinions and feeling without worrying about whether anyone will take it personally or get mad at them for what they say.