Husbands family have thrown my life in turmoil!?

I'm not one to deny responsibility for myself so I can openly admit that I am too sensitive sometimes. My husband comes from a very tight family. Even though him and his twin brother are 27 they both allow their mother to intrude into their lives. My husband has a son by his last marriage and together we have 2 more boys. Since I have moved to missouri for his son I have been treated like a dog. Nvm, their dog gets treated better! I'm serious though! I'm so sad and lost. I don't have a family to act as a support through these hard times. I was told today by my husbands brother that I am not my step sons blood so I don't have the right to enforce rules he doesn't agree with after he blatently broke one and had my 6 year old step son laughing at me as I tried to discipline him! I feel like I have died inside from their critisim and their thoughtless actions. My husband cares too much about his family to stop it out of the fear that they will bring him down too! What do I do? I can't cut them out of my life because my husband would never let them get too far away!