This must be a very difficult time for you and your parents. Assisted living is a big decision and a big adjustment, and, depending on the health of your parents, it can also be a big relief to you to know that they will be watched over and cared for every day.
You can donate fabric to specific charities. Project Linus is good, Quilts of Valor or Wounded Warriors would be delighted to get any Red, white, blue fabrics, etc.
If you give it to a local quilting guild and you want it used for charity quilts, you need to say that to them when you donate, and get a tax receipt for the value of the fabric.
If there are any completed quilt tops, see if anyone in the family wants a quilt pieced by your Mom, let them select and they can get it quilted on their own - but it's pricey. Otherwise, either donate to a local guild for charity or sell right here on the QB.