my sister was handling mom and dad''s money and dad has alzheimers and mom demenca she got my mom to get a loan on there house and give her the money

I suggest that you contact an elder law attorney in your area. An elder law attorney can talk through your situation with you, and explain your options. It is possible that your sister abused her authority under a Power of Attorney (if she was given one by your parents), or she may have improperly influenced your parents to sign documents themselves. A lawyer can help you decide if her actions were illegal, and advise you on how to proceed, which may involve contacting your parent's bank or the police for criminal charges, or filing an action in civil court. The elder law attorney can also help you come up with a plan for caring for your dad.   Tonya R. Coles, Attorney at Law Elder Law - Estate Planning - Probate tonyacoles.com