I am being told to let my brother take charge of the financials and get a POA. Any advice?

My mom has Alzheimer ------ she is forgetting things and I am being told to let my brother take charge of the $$$ and get a power of attorney to handle affairs --- but she is still very able (President Reagan had severe Alzheimer's, but, though I, as a Democrat, disagree with him, look what he did ------ run the free world and caused the breakup of one of the world's greatest threats to freedom, the USSR)!!!!!!!!!!

She has always been incredibly independent and there has always been a very strained family relationship. The brother is threatening to go to court to get a custodial relationship and she is threatening to go to court to stop him. Also, my dad recently passed away, adding tom the strain. He always favored dad (he told him to "take care" of her (and me). I always favored my mom. Also, many years ago, there was marital infidelity from the dad, adding to the continued mistrust. I have always fought to keep the family together as well as for myn Mom. What do I do?