There are his 2 sons, and he may have samples at the VA hospital from his care by them. I have old hats and gloves, but I don’t think the regular public sites do that. Do they? I am curious as to what Neanderthal blood I may have. My molars are very large, my enamel and dentine very hard, and my upper lateral incisors are slightly shovel shaped.
Today it seems as if my whole mouth is shovel shaped, which will come in handy tomorrow when I’m complaining that I can’t lose weight.
Get your DNA done (it’s a kit, you do it at home), and each of your sons, and there are multi-kit comparisons that are done on the site of the testing kit vendors, as well as a site like GEDmatch.