Replies to 'Co-Parenting'

My husband and I have four children. Two are his 16 daughter and 13 son. One is mine boy7 and we have one together 4 daughter.  We have visitation rights to see his kids every other weekend and for 6 weeks in the summer. He pays his child support loyally each week and has since the very beginning. Our problem is we never get to see his kids. They move all over a lot and now at this time we don't even know where they live.  It is every year we go through the same thing, they come over for a couple months and then the next year they don't want to come. My step daughter is only 10 years younger than me and blames me as the reason they won't come over. My husband has treated my son as his own since the very beginning. My son knows him as his father since he knows no one else to be so. My step kids treat my son like crap. They are mean to him and don't invite him to do things with them just my daughter.

The point: My step kids mother allows them to do drugs with her and drink and party. We have tried to be an influence in their life, but as soon as we try to set guidelines their mom rips them away. In my opinion they don't want to come over because they have rules here and because they don't like me or my son. They stopped coming around this last may and haven't been over since. We are still paying child support but where are our rights to see these kids.  We are at ends wits about what to do. We want to see our kids. Oh and to top it all off my step daughter just went and got a tattoo on the back of her neck. And both the kids have a myspace account. My step daughter has a picture with her saying she is drunk. And my step son is posing as a 15 year old. What do we do about that? Any help or thoughts would be appreciated. Thanks.