They are a danger to others and probably to themselves.
They need professional care.
I would suggest that you insist they receive it before you and your boyfriend get accused of inadequate care.
If they receive any form of Medicare or Medicaid they are eligible for inpatient care at a facility capable of handling this type of illness.
At their age and weight they are susceptable to injury if you needed to restrain them. If that happens the state may step in and the family would lose any control of the parents anyway.
Protect yourself legally from any charges or complaints that might arise.
Especially if the two of you are living in their house.
I would at the very least consult with a lawyer to see what you could do to protect yourself from any legal issues that might arise.
They will not get better. They do not have the capablity to reason rationally.
I have known people that were jailed in similar situations.
By the way as a caretaker you could be charged with neglect if you allowed the patient to go 2 weeks without being properly cleaned. Shalom
You have my sympathy. My adopted daughter became violent and I was in a very similar situation. No sleep, constant state of fear/anticipation, total disruption of life, from the most basic everyday routines to outings, extended family, etc. It is one h*ll of a way to live. I don't know how I survived, and I pray that you do also. Get help.