I feel for Bart and Princess. That cannot be easy to see their father's health fail and to feel really helpless.
Darn stubborn men! It would be ideal if your ex would get his affairs in order with an advanced directive and a power of attorney for health and financial decisions if needed.
What Bart and Princess can do is reach out to the social worker at the hospital to see if they can offer direction. Also, I would start Googling topics about how to talk to an aging parent about end of life decisions. Perhaps they can write a letter to him expressing their concerns, telling him they just want the best for him.
Sadly, there are many people in the same situation. There is something about facing ones own mortality that makes some people just want to avoid dealing with it.
I'm glad you are getting closer to moving into your new house.
((HUGS))