My mom is in semi independent living and 88 diagnosed with beginnings of dementia. Before she moved there she turned the house over to my niece and nephew and it was legally put into their names. She wants to move back and swears she never gave her house up. I told her she can't because it isn't hers and besides she needs to be in a safer place due to falls. She becomes very belligerent with me threatens to sue us all and that we forged her signature. I am very stressed out dealing with all this. Any recommendations?
You should definitely consult with an attorney.
If she couldn't live alone, she probably didn't have the mental capacity to give her house away.
If it was given away, as others had mentioned, there will be a major roadblock for when the time comes that your Mother may need to depend on Medicaid [which is different from Medicare] to pay for her stay at a facility.
Curious, who's idea was it to sell or give away the house?