For the legal eagles out there...All parties are in NY state: sibling B has the old power of attorney. Mom wanted to change it to a joint POA between siblings A and B (to act together, not independently). The new POA (which revokes all prior POAs) was completed by Mom and A, and sent to B, who is not completing/returning it (he must sign/notarize it). So does the old POA rule if he doesn't complete it--does B essentially have an incentive not to complete it (he is a control freak)? Mom plans to complete a new POA without B if he refuses to complete it but she is dragging her heels and I am worried about her (you know, the what ifs...). I'd appreciate feedback if anyone knows anything about this.