That is certainly an Oak - Quercus sp.
Now, I'm going to tease Quercusnut, because all those species suggestions are from the White Oak group of Quercus species - and all members of that group lack bristle tips on the leaf margins.
I see a bunch of bristle tips on margins of the leaves in the photo above.
Young seedling oaks, growing vigorously, often have leaf morphology that varies from the standard characteristics of the species. But, things like bristle tips will be there regardless of whether the leaf is fatter or larger or appears less lobed than the normal that one is used to - or looks at on-line.
I'd bet dimes to acorns that your granddaughter has brought home a Red Oak - Quercus rubra. It is a fine tree - just as are all the ones Quercusnut mentions - and it will become a very big tree, potentially 100 feet tall and 2/3rds as wide, especially if it finds its happy spot to grow. If your yard or proposed site can't accommodate that large a tree, look for a friend's property, or possibly a local park location where it could live out its days.
I wouldn't argue with any of the praises already lavished above on this genus of trees, and would add that oaks support/host so many species of insects which provide food for birds and other fauna on which to raise their young.