I have been playing around with the website: https://colourise.sg/#colorize which allows you to upload black and white photographs and it will attempt to colorize those same photographs. Recent attempts:
Obviously, the site does a much better job on photographs that are in the best of shape to begin.
The above picture of my grandmother (center) was also taken on her wedding day with her sister, Essie, on one side and her mother, Phebie Ann Gardner Koontz on the other. The coloration is much better.
And the whole Koontz family portrait really came out well: