My mother and sister are financially draining me, both have a serious gambling habit.?

I need to break all ties with my mother and sister, but due to my mothers age and health I feel guilty. As a child my mother was very physically abusive and mentally. She plays one sibling against another, she loves to make you feel guilty. My mother is 73 years old and I am 52 and she is still controlling my life. She complains that she is in constant pain, but will go to bingo or the casino every chance she gets. I can't take anymore of her complaining about how broke she is, and that she is lonely and bored and that is why she gambles so much. Everything is about her, it always was. My sister is also addicted to gambling and comes to me for money to pay her rent or car payment. How do I back away without the guilt driving me crazy. I really need help! I am giving serious thought to moving as far away as possible to avoid them, but my husband cannot just up and quit his job and I have my beautiful children and grandchildren to think about. My husband hates my mother and sister, he thinks they are self serving and I agree. I just cannot listen to anymore poor me, they are doing nothing to help themselves.