It's a Bur Oak....Quercus macrocarpa.

Thank you, Conifer50. I have been told by my In-laws that it doesn't get acorns or nuts- would that mean it's a male tree? I don't see any others nearby.

Oaks are monoecious (both sexes on the same tree) but are outcrossing (won't pollinate itself), so if there's none others nearby, it won't get any acorns. Must admit though, I'd be surprised if there really are no other oaks nearby!

Resin

This tree stands alone at the corner of a large yard. Lots of farmer's fields surrounding it. Gosh, it's been there all my Husband's life and he's 54. How close do Bur Oaks need to be in order to pollinate? I've never seen a squirrel in this yard either, which is odd, since we are out in the country.

The pollen is wind-blown and can be carried 100km or more, though the vast majority only blows a very much shorter distance.

If the tree had just a small number of acorns (from a small amount of pollen arriving from a distance), would your in-laws spot them, or would it need a heavy crop for them to notice?

Resin

They wouldn't necessarily have noticed acorns IN the tree, but I'm sure my Father in Law would have noticed acorns on the ground. He mows the lawn at least twice a week and sprays all the weeds. It's like a hobby for him...