How to deal with Step Child and ex Spouses?

i am not crazy about the way my ex husbands wife treats my kids..please try the best you can to accomidate your stepson...stick with your rules for your home and let your husband know that this is a must...i think that "step children" will push as hard as they can to get their way, but there has to be a reason for that..in my case my children only get to see their father when it is convenient for the new wife which is about once every 6 months or so..please dont take offense, but she says the same thing that you do and i think that my ex husband needs to set some ground rules for when his children are there...