We are sorry for your loss. You don't need a scanner. A careful phone photo of each print is enough for a memorial film shown on a TV or screen.
A sample film (2:52): Faro and Doris Caudill and their daughter, homesteaders in Pie Town, New Mexico, in 1940, made from public-domain Library of Congress photographs by Russell Lee. Your film uses only your photos.
Five steps
Lay the print flat on a table near a window, in daylight.
Turn the flash off; it causes glare.
Hold the phone straight above the print, parallel to it, not at an angle.
Fill the frame with the photo; you can crop the table out later.
Take prints out of frames and albums with plastic sleeves to avoid reflections.
Common problems
Glare: move away from overhead lights, and let the window light come from the side.
Blur: rest your elbows on the table and tap to focus on a face.
Curled prints: press the corners down with a sheet of clean glass or books at the edges.
If you are making a film for a service this week: send up to 10 photos and watch a free 30-second preview of their film in about two minutes. The full film is $199, ready within 24 hours of your photos.
Free previews are open now. Paying for the full film is not open yet: your private preview page shows the button when it is.