My father-in-law recently had open heart surgery,,he is 85 and wasn't in that great of a shape going into this surgery. Now they are telling us that he isn't recovering as was hoped for and expected. He is on a ventilator and is in a care facility, his daughter is making all the decisions and does not keep us updated, which for me is frustrating. I encourage My husband to go and see his Dad sooner than later as we don't know the outcome of this situation. His sisters are in touch and Neil doesn't want to disrupt their plans.
I am sorry your father in law is in such rough shape. My late Aunt was in the hospital with pneumonia. I was the only family member close by. I was not the health care proxy. The doctors gave me very little information for legal reasons. She was there for 2 weeks and I took the trip to see her almost every day. I called every relative and let them know she was in rough shape. I had no way of knowing the outcome. She died within 2 weeks.
I would suggest that if your FIL is in rough shape and is on a ventilator your husband should get over to the hospital ASAP to see what is going on. It sounds like a precarious situation.
It doesn't matter what his sisters say. They may have no way of knowing what the outcome will be. At the very least your husband will see his father. Hopefully he will recover.
Encourage him to go, and go with him if you can.
I appreciate that it is frustrating not being kept in the loop, but I expect your SIL has her hands full; she may also assume that if you want to know what's happening you will ask. So do ask. Text enquiries are best, because they can be answered when time allows and you don't risk inadvertently butting in at a bad time.
Will you go with him?