what to do about meddling in-laws?

[SAD]

My MIL and FIL manipulates my husband in every way they can. He lets them control and tell him what to do. They manipulate him by telling him they are gettin old and won't be around much longer. They haven't reached 70 yet. We have been separated for 11 months with children involved. My MIL has never liked me from the beginning just because I got compliments on how cute I was. She beging telling everybody I didn't like her and I didn't even know her that well. She wanted us to come and see her everyday and stay up under her every day. They have other children, my husband is the baby boy and he has always catered to her every need and call before I came along. Every little detail she confides in him, they used to talk like mother and daughter instead of mother and son. I know my husband is a "moma's boy" and I used to call him that he only denied and so did she. They are big liers. FIL used to like me but he is just conniving as she is. This family has issues and I just couldn't deal with all the back biting, lies, talking about people, and hostile feelings. She really isn't a grandmother to our children, they're only concern is for their son. Can someone please help me out with this one. Please give loving advice on what I should do, we have been married for a long time to call it quits now.