Q.bradford pear not flowering
I have two established flowering Bradford pear trees in my front yard. They were planted 3 years ago but have never flowered. Why? All others in the neighborhood have flowered but not mine.

It is not unusual for an ornamental tree to take up to 5 years to produce blossoms. I would continue to care for the tree and have patience!
Here is a link about Bradford Pear trees.
https://www.gardeningknowhow.com/ornamental/trees/ornamental-pear/bradford-pear-tree.htm