Recently my FIL passed away. MIL is in her 90's and we see the pace of her cognitive decline increasing. What MIL wants more than anything is to move in with SIL who is in her 60's and single. It makes sense for both of them, but the problem is SIL is awful. She hates her brother (my DH), she is selfish. She sees her mother about 6 times a year, always at her own convenience and it is MIL who drives to see her. (She still drives, but directions are becoming a problem). We have discovered that MIL has put SIL's name on all financial accounts. MIL wants to buy a house for her and SIL where SIL lives, and SIL is all for it. At this point, DH and I do not feel we can stop this. We have been thinking that if MIL gives SIL power of attorney that this will provide some legal protection. That is, if SIL has POA, she will be legally required to make decisions in best interest of MIL. It is likely that SIL will see getting POA as a power grab victory, but we are thinking we can "hoist her on her own petard", that we can use her own manipulations to keep her in line, and then if need be, have a legal basis to intervene.
We don't believe we can stop MIL at this point, so is it accurate that there is more protection legally for MIL or for us, if SIL has POA?