N.T.
I have the same problem. I have a son from a previous marriage and my husband has a daughter from a previous marriage also. His daughter lived with us full time. We have 3 children from our marriage and 1 adopted son. My husband was always stricter with my son then with the other kids and now he is the same way with our adopted son. I have always treated our children with love no matter what. I have no solution for the problem except to always be there to let them know that no matter what they can count on you to love them and care for them. My husband and I fought all the time over it. He never felt that he treated them any different. He always said that I was babying them and that they would grow up to be sissies. My kids came first and he could never understand that. We still fight over the kids. My son is now 30 and his daughter is 37, our other kids range in ages 29 to 12. You have to decide how much you and your son can take and if it is wise to stay in the relationship.