If your parents are still MENTALLY competent to discuss their situation, get them to a lawyer, have a durable power of attorney set up. If yu get power of attorney over their finances, then you control what the money is spent for. this assures that yor parents are safe. thae attorney will tellyou more on how to manage your parents health.

I had to iimpoverish my parents,put dad in nursing home (because of dementia and violence). I had to have them sign quit claim deed on house so it would not be lost and put it in all siblings names. I paid all bills from dad's annuity for Mom until she passed away. Hope this helps.

to amnswer original question, take them to family Dr. for evaluation