I hesitate to post my situation because I don't want it to influence you to break up w/ your DH if things can be saved.
I can totally identify...I have 3 children and the husband has 2. Mine are 13, 11, and 8 his are 12, 6. It is very frustrating. I feel like he picks on my kids especially my boys constantly. He yells and says stupid things and blows his top all the time. When his kids are around they could proably tell him to F*** off and he would look the other way. When I bring it to his attention, he claims he "never" hears his kids and portrays them as complete angels"they do nothing wrong"..which could be farther from the truth. I have put up with ex-wife, ex girlfriend drama and step kid drama that a year ago it drove me to kick him out. After a month, I let him back in and tried to repair things and he promised to change. The more I think about it, the truth is...no one changes. It is a constant battle. A constant fight. His kids strive for attention and act out horribly. My kids hate him at times and they get so upset. I treat his children like gold, I pick them up whenever I am off of work and have them stay, I get them haircuts, manicures, buy them things, make homemade breakfast, lunch, dinners. I wash their clothes, tuck them in at night, play with them. I