That's very unpleasant stuff to deal with, (I've done it), but imagine if your family did not have you to handle this tough business right now. You are the foundation for the whole production and you are performing beautifully. Sorry it's happening, though.
One way to look at it, (this helps me), is that when everything is going sideways, I just say "bring it on". Let it rain **** on me and get it over with because you know that these things always go in cycles if you're living right. Get this bad stuff out of the way so that the good times can begin again.
One year ago today, my dad had dropped dead suddenly in Minnesota after I'd just spent a month with him nursing him back to relative health after a stroke. He died 3 days before Christmas and I had to jump on a plane pronto. After the usual death arrangements and putting together a memorial, I then spent about a month in MN. clearing out his house. It was bitterly cold, (-20 windchill most nights), and I had the flu the whole time it seemed. Fun. I've lived in southern CA. for 30 years and don't usually visit during those months.
On Christmas Day this year, everyone was having a better time. I'll be in Europe this summer with my siblings and other friends. The other stuff happens, (life/death/etc.), you just need to power through it and get to the other side where happiness and fun is waiting for you. Best of luck and Happy New Year.