My significant other of 25 years is having short term memory and mobility problems. He is not incompetent, but his son who is POA has given a financial firm (Morgan Stanely) a statement that SI has a diagnosis of dementia. The POA has taken over all control of his assets in his account. I know the POA can be revoked, but I believe he will contest it and claim he is incompetent. Since we never married I have no legal standing. Has anyone had to have a competency test to prove before it gets into a legal battle?