I do not want nor am I trying to take anything away from his kids. I am simply saying that there should be away. That my kids don't get kicked out of there house. When and if my husband dies. And then when I die I will have a will. Stateing that the house is to be sold and split 5 ways not only 3. Because he has 5 kids now. Not 3. But we will figure something out. If we have to go to court about it then I guess that is what we will do. Because there are special circumstances as to why he can not conply to this agreement
Sorry, but your will is irrelevant because IT IS NOT YOUR HOUSE. Upon your husband's death, the house goes to his kids from the first marriage. Your kids have ZERO claim on the house and your will will have absolutely no more to do with it than if _I_ try to leave the house to my daughter in MY will.. The only way they might have a claim is if the divorce decree said that HIS children would share in the value of the house without specifying that it was referring to his kids from the first marriage. That is, however, very unlikely.
There is a very simple solution to this if you would get off your entrenched position that your kids have some claim on the house. Buy an insurance policy large enough to cover the cost of buying the house. When your husband dies, you collect the insurance policy and use it to buy the house so your kids can stay there and his kids from the first marriage get what they are owed.
Ideally, he would talk with them in advance to make sure they agree to this (did you ever stop to think that one of them might want the house they grew up in, too?). Your husband could reach an agreement with them that they would accept a certain amount of money. If they won't agree to that, your life will be easier if they can at least agree on how the value of the house will be determined.
He could also see if they would agree to sell their right to the house now rather than waiting for his death if you can afford to buy it.
But to work out any solution, you're going to have to stop this nonsense about your kids having any right to the house. They don't. As far as the law is concerned, their rights are no greater than if you were renting the house.