We did the same for my Sister, made sure that my Mom signed over the house to her while she was still alive. Fortunately I was able to get concensus from the siblings (6 of us). She did the lion's share of the care-taking so it seemed fair. Still when the end came there were a few grunts and murmurs. Since then, however, everybody has let bygones be bygones. Time helps with that.
I'm sorry to hear about your sister's anger. It's a tense situation at best and with her hubby's health issues looming on top of your Dad's passing, I could imagine the stress getting to anybody. Hopefully she'll settle a bit in time.
I remember going through my Mom's things after she passed. She still felt attached to them somehow and I felt close to her.
David
Height: 5' 10"
Starting Weight: 292
Starting Primal Weight: 275
Current weight: 240
Goal weight: 172
Body Fat 31.1