?". . . . my Grandmother Geraldine's last husband" seems to imply she made a career of it. Not to feel like the Lone Ranger, though. I had a Great-grandmother who remarried five times. She had the money, she could afford it. My Grandfather and his brothers were real hellions and almost literally ran them off one after another. My Great-grandfather died young. My Great-grandmother wasn't much of a disciplinarian (she should have hired - or married - a marine drill instructor). An older cousin often stated the boys would "tag-team" the husband-of-the-moment, doing things like standing on a tree stump to wag their finger in his face, daring him to raise a hand against them and generally treating him like the proverbial ugly stepchild. The longest any one of the husbands lasted was a year and a half.
Now that I've got that out of my system, we can proceed.
Re your Grandmother’s material and photographs. You might consider the Family History Department of the Church of Jesus Christ of Latter Day Saints. The Mormon Church has the largest collection of geneological and historical records extant - and it continues to grow. Thousands of Missionaries worldwide are assigned to do nothing but collect information of geneological and historical significance. This information is processed and made available to the general public free of charge or at nominal cost through more than 1,500 Family History Centers throughout the country.
You may donate everything or arrange for a team of Missionaries to reproduce everything and keep the originals. The Church will organize, catalog and preserve everything so as to minimize the chances of any part of it ever being lost or destroyed. If interested, consult your local directory. You’ll find the Family History Center nearest you among the listings for “Church of Jesus Christ of Latter Day Saints.