It is 25-30 ft tall now. It is for sure a locust tree. I figured it made seed and these came up from the previous years seeds dropped from the tree, they were not suckers off the trees roots, but true seedlings. That I do remember.
It's foliage is very delicate, I will get a pix tomorrow hopefully. We are in the middle of a terrible thunderstorm right now with heavy rains. If it clears in time, I'll get one today. Thank you Alyssa for your help.