Call your hospice nurse first thing Monday morning, explain the situation, and request an emergency social work visit. Seriously, get the social worker in ASAP. This kind of situation is why we exist. He's not going to listen to you all apparently, and you don't want to have to be in the position of being the bad guy.
The social worker may not be able to "fix" it -- we don't actually have magic wands, mores the pity -- but she (or he) will give it a damn good shot. Most likely by giving your FIL a non-family place to vent out all the grief and loneliness. And then she will gently and kindly work on getting him to give your MIL some down time.
I'm so sorry your family is going through this. Use your Hospice team as a resource as much as you need to -- it's what they're there for.
ETA: There is no "right" thing to do in these situations. Get that idea straight out of your head. We all do the best we can and that's all anyone else is allowed to ask or expect. Don't torture yourself thinking you have to get it "right."
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