My brother is in control of my mother'e finances. Now he wants me to take over as caregiver, but I can't afford this. What can I do?

My mother is 95 and needs 24 hour care. She cannot afford this and my brother refuses to apply for medicaid. He has returned my mother to her home(in NC) in Nov and has been taking care of her. He lives in California and must return home. He has been paying for aides three times a week for 3 to 4 hour shifts. He now wants me to step in. I cannot afford to quit my two part time jobs unless he will pay for more aides during the day and some nights. Both my brother and sister in law have made me feel very guilty. I have taken care of my mother in her home( there five days a week and aides on the weekend). My brother would not continue to pay for this. I paid but could not continue. This is a very stressful situation. Last year(2011) my mother stayed with my brother but went into depression after being there a few weeks because she wanted to come back to NC. My husband just complains and insists my brother apply for medicaid. We are not getting along as well.