I wouldn't buy my father in law a gift from here. Actually, I prefer to bake/cook for him (and my own father.) I'm telling you, they always like it!
Plus, it's personal because you spent the time to hand-make the food.
You're especially in luck if he's like my father & my father-in-law, and loves sweets. Find out his favorite food and you could try that out.
Or. . . a blender? Lol. Kidding.
Another thing we like to do for our parents (and they do it for us sometimes) is take them out to eat for their b-day. It's hard to go wrong there, as long as you take him somewhere he loves.