Not knowing how they drive you crazy makes it difficult to give you suggestions, but here goes:

Parents, even if they are step-parents, usually have history with us and because of this history they drive us crazy. What I try to do is think of how I would deal with these people if they were really strangers and act accordingly. I use this tactic with my husband sometimes too when he is driving me crazy! Sometimes it works and sometimes it doesn't.

The next scenario is that I try to remember that the time I am spending with them is short, that controversy will not help and that if they were not here to drive me crazy anymore, I would be unhappy. So, I try to make the best of it. Be non-judgmental and hope for the best.

That's about all I can offer now, but hang in there - it will be okay!