My siblings and I suspect our brother, who has lived with our mother who has dementia for more than 15 yrs since our father died, has been mentally/physically abusing her. We already know he has financially abuses her assets for his own greedy needs because she made him POA over everything. Before she got so bad with dementia, she had all our names put on her home when she died, but when she got really bad off and he started taking over her bills, etc., we found out that he got a quick claim deed to her home and sold to him for $1.00 even though he owns a nice home that stays empty since he moved in with her over 15 yrs ago. We have already turned him in for elder abuse, but they say since Mom is not complaining and they talked to her, she says everthing is fine with her and happy he is living there, but we have heard that he threatens her not to say anthing. We just need some solid proof to show he is abusing her inside her home. Is it legal to install a hidden camera?