Best way to parent a selfish, ungrateful, angry stepson?

It's hard to help you, because you didn't mention how old your stepsons are. You just have to lay down the law, regardless of what age they are, and send them to their room without dinner if you have to. Talk to your husband, also. How is he dealing with his sons? Have him give you advice on what to do. He has dealt with them longer than you have, so he should know some tricks to dealing with them. I hope I've helped.