Welcome to AAPK. Looks like a knife definitely worth fixing! There is a subforum here all about knife repair and there are several skilled knife mechanics that are members here who could repair your husband's knife. You can see examples of their work in the Knife Repair and Restoration subforum.viewforum.php?f=48
. Recommend you post your knife and questions there with a request for help.
If you're thinking of doing the repair yourself, there are some tutorials in the Knife Related Tutorials subforum. Unless you're very adept at something like this you probably should get a couple of old "junk" knives of similar construction to practice on first, before attempting repairing your keepsake knife.