Can I report relatives attempting to take control of my mother who shows signs of dementia?

My mother lives alone in another state and she is a narc with signs of dementia and health problems, but she is able to get around enough to not be called dysfunctional at this point. She has a cousin who lives in another state and he has a married daughter. They both went down to visit my mother as a side trip to a conference the father was attending this past February. His daughter ended up fast friends with my mother, even sending her a mother's day card. In August, her cousin (the Dad) flew down to spend a week with my mother. I don't know him and only spoke to him once, after she was recently hospitalized for AFIB. Then, two weeks later, his daughter, husband and two kids go down there to visit my mother. They all know that my mother has been taken advantage of by a former financial advisor. I have concerns, because when I had spoken to the cousin, he never even indicated that he was or wanted to visit my mother. I happened to find out from the cousin's brother, who I speak to. I also found out that her cousin was trying to convince my mother to move to his state near him. My mother didn't agree. This is their second attempt at this. Although I may not have a good relationship with my mother, I do have concerns about what these people are attempting to do. I don't want to jump to conclusions here, but it sure does look bad when they are pressuring my mother into a move when she is 85 years old, has cancer and would have to sell a home. There's more to this whole story, but this is the best way I can sum it up. I think they know about me not having a good relationship with my mother. It's not about me being neglectful about putting her into assisted living or anything like that. She refuses to go into assisted living at this point. Even though my name is on estate papers, she plays such games that I don't even know if I am DPOA at this point, because when she made new papers recently, the DPOA was left out of copies that I got, but I didn't get a revocation letter either. Apparently, the attorney's assistant said my mother doesn't want me to see the DPOA, but I do have the health surrogate form. My Dad was responsible for what she has now and she never appreciated him or me. He wanted me to look after things because he knew she wouldn't. That being said, am I being overly suspicious of these people? I just know that her cousin and his daughter have taken money and whatever they could get from his brother who is on Social Security and doesn't even have a car.