Step Children vs. My Marriage...Please help.?

Something has to give here - you're about at your breaking point and your husband hasn't clued in? It's definitely time the two of you get a sitter for your little one (when the other 2 aren't there) and TALK between yourselves and hash it out. Make it clear to your husband that you've had it and that if sh*t doesn't change, then you'll have no choice but to leave. He needs to understand that you are married - you should have as much to say about how the children get disciplined as he does, especially when the oldest is being a little b*tch of her own. Most of that is her age (15 is the WORST - I know - I raised 2 girls and one boy!) so you do have the 'sweet 16' to look forward to (it really does get better!). As far as the girls your son, etc. I wouldn't have any of that - maybe you should seriously consider a sitter (is your mom available??) at least some of the time. Your husband needs to be made aware that he needs to start showing his girls some attention - they are at the age where they need one-on-one attention and it doesn't sound like they're getting it if they freak out when your son gets some. I think that is the biggest issue from what I can read into your situation. Let him know if he doesn't start paying attention, they're going to find it other places...especially the 15 year old (if she isn't already). If you walk away, then the girls win - that's not what you really want. Stand up, stand firm, and don't let him turn things back to the way they are.