They are Redbuds. I wasn't honestly sure since the one I planted looked different. The buds came out a light pink, but as the weeks have progressed it has taken on that standard lavender color and the stalks have branched out a bit.

The last house that I lived in had a lovely little fruit tree orchard in the backyard when I moved in, planted by the previous owner of the house about 15 years earlier. All of the trees were pretty good for climbing but one in particular was a beautiful Yellow Delicious Apple tree that was about 15 feet high. It had thick lateral branches that spread out nearly horizontally in a beautiful, balanced way. PERFECT for climbing, especially younger children, and several children who visited enjoyed climbing it. Then, a few years later, a freak storm came through and blew over the largest tree in the yard - a 50-year old Silver Maple that was at least 75 feet tall growing near the edge of a swamp. When it landed the crown of the tree SMASHED the fruit orchard to smithereens, including the Yellow Delicious apple tree that was the most perfect climbing tree I could imagine for children. :( Fortunately, a nice apple tree and a large Black cherry were far enough away to be spared, and they were pretty good climbing trees too. :)

Box elder grows in zones 3A to 8B so it is possible that this might grow in your area. Check searches using Acer negrundo. Box elder is listed as susceptible to Verticillium wilt and sensitive to pests/diseases.

And one last picture Not the clearest image of the leaves.. but I had to zoom in and take the picture from about 50 yards away