I am having concerns.
That same scenario happened again when MIL was admitted to the hospital -- my husband told FIL that he wanted to speak with her doctors to get a more first-hand account of her medical issues. FIL blew up and got very agitated -- questioned why my husband wanted to do that. I just don't understand why that would be a problem if everything was above-board.
FIL has always treated MIL in a very infantile way. He's encouraged others to see her as silly. Rolls his eyes at everything she says. He really plays up his role as her "caretaker" - going out of his way to make sure everyone knows how much he's had to do for her.
After she got started on that oxycontin, (which was years ago), MIL would get up, take her oxycontin and go back to bed and that's it. She was always out of it, always sweating profusely, almost always in bed. FIL had a very flexible job -- he would come home, give her the pills and leave again. He was never home. He started taking solo trips to Las Vegas and one time MIL found pics of him with a female co-worker in Vegas. He claimed he'd just "coincidentally" run into her on the plane. He supposedly had no idea she was going to Vegas, as well -- and they'd hung out together. The family found nothing odd about this, but I was flabbergasted. So I would say that, yes, he has a history of being untruthful.
I guess I'm concerned that he's moved on and doesn't have MIL's best interest at heart.
That was Monday. It's Wednesday night now and her heart is beating very well, she's lying there breathing on her own -- it's just a matter of when the dehydration and lack of nutrition will shut her body down.