BTDT. I agree with the other poster, you will prove yourself by being a loving, gentle person who does not put their mother down. Our bm tried this too, and at times it worked, but I think it is just because the kids are trying to be loyal to their mom. They know how their mom expects them to feel towards you, and decreased time with you will not help. I hope you get regular visitation or custody, as this is your only chance to show "your true colors" to these kids.
suggestions on how to deal with your list:
1. If you work, occassionally mention how YOUR money is helping buy things for them/household, etc. Do it very casually, and they may act like they aren't listening, but they are.
2. Occassionally talk to dh, when the kids think you don't know they are listening, and comment about how much you love these kids as much as your son. Be sure to treat them all equally, they will see how you feel.
3. Make that comment out loud. "We couldn't swing the money, ds/dd didn't get to go either". On that one, I would be blunt. And I would say, we really wish we could send everyone, but we can't. So no one goes.
4. How idiotic. I doubt the kids believe this one anyway.
All you can do is love them, treat all the kids equally, (and my ss got away with alot more than my ds because of all the crap he was going thu, he didn't get in the same amt of trouble if he did something wrong, just because of the situation/stress)
GOod luck!!!!