I know this is a really difficult time for families. I've been through it.
In my area, there is actually a woman that helps with these things. The family, of course, goes through things and takes papers, photos, antiques to be kept in the family, etc and she advertises an estate sale.
She organizes things room by room, for instance, kitchenware in the kitchen, drapes and linens in a bedroom, garage stuff....
She prices things and usually on the third day, she will let people have things for a discount or dollar a bag on some items. It works out pretty well.
I think she charges a percentage of the money so it's in her best interest to get good prices, but some things, like a drawer full of mis-matched forks she may let go for a lump sum.
She's done it for years and lots of people hire her. You might want to check with Adult Services in your area or even check with the assisted living facility to see if someone in social services knows of someone trustworthy.
It really takes a lot of work off of the family, especially living far away. I am going through the same thing with my aunt in another state.
A really good person will set aside any veteran paperwork or things like that you missed on your go through.
It is strange to go through things while your family member is still alive, but that's why it's important to save "memory" things for them.
When my dad passed away, I couldn't go because I had a broken leg, but my sister went through everything and I have all my dad's report cards from when he was a little boy, his Navy books and photos, his cub scout pins. Those things are certainly treasures.
I wish you the best because I know these things are hard, but I'm hoping you'll find someone to help. If I was closer I would do it or put you in touch with the lady I know. We're pretty far away.
I'll keep you in my thoughts.