I recently got married and am now a step-mom to an 8yrs boy, I have a daughter that is 9. It seem that everytime my step-son talk to his mom or go visit her (my husband have cusody and his ex-wife live in another state) he seem to ignore the fact that we have rules in our house. How to I handle it?  It seems to think that his mother can do no wrong and she lets him do whatever he want. There's more but that will do for now.

Wow, it's been a long time since anyone posted on this website.  Glad to meet you here. 

Your step son is going to put his mom on a pedestal for a very long time, so get used to it.  But that doesn't mean that he should get away with not following the rules or disrespecting you in any way. 

It might help to talk about the rules as soon as he returns from his mother's house.  I wouldn't disparage her in anyway, but say something like, "I know the rules are different in your moms house, so I thought we should review what the rules are at our house in case you forgot".  Maybe you can make it a game or a contest.  This way you can remind him of the rules before he breaks any of them, after all, you want him to be successful at keeping them. 

Angie Blackwell, Stepfamily Coach,  http://www.blackwellfamilyresources.com