Tree ID

[pinksand]

My parents have this tree growing in their backyard. The sapling showed up a year or so ago and has grown quickly, but now my mom is wondering if it should be removed before it gets too large to change her mind. The location is shady and sloped with a few large oaks, and a corkscrew willow that isn't doing well and only has green growth at the top where it can reach the sun.

Any ideas? (Sorry, the photos aren't great

[!potatoes!]

cherry? elm?

got an pics of the bark?