Wanting to get POA for mother-in-law. Need help with processes.

M.I.L in nursing facility. We believe her B.I L has taken funds due her. We currently have medical Power of Attorney for my mother-in-law. Recently, she has 'lost' her insurance. She is now private pay. However, have found out that her brother in law had poa over her and her now deceased husband. Husband was a veteran, and believe she should be getting spousal benefits as well as her social security. I am completely overwhelmed! Not sure if my hubby(her son) and I should take on Financial poa as well. After talking with the nursing home, we believe there has been some fraud performed by the brother in law, who resided in another state. My thinking: Call the state, get a social worker on the case. If there is fraud, the b.i.l. needs to be held responsible. Want to track him down...Really would like m.i.l to be able to move to a closer facility and have better care! I need to know the process for this...Getting her insurance back, making sure she is getting her and her husband's benefits, and that no one else is messing with that..Thanks in advance for any and all help!