Doctor told hospice that Dad has very little time left, so they moved him to the hospice inpatient unit. If he survives a few days, they'll send him back to the nursing home. Sister actually called me this afternoon, and we had a long conversation, with no mention of the frustrations. A text a few minutes ago said his blood pressure is low. Sister took today off and is going to take tomorrow off, too. She's done avoiding, and just wants to be present with Dad while she still can. I'm glad she's come to this point, as it will make it easier to deal with his death without lots of guilt and regrets.
I've contacted relatives to update them. I've made a reservation for a motel beginning Thursday night. Now, we wait. The waiting is hard.