Bringing Up Babies?

For the past few years a pair of broad-winged hawks--bird predators, alas--has nested in a neighborhood tree.  As far as the jays, crows, cardinals, mockingbirds, wrens, thrashers (and on and on) are concerned, they're very unwelcome.  We know for certain that some broods of green herons have fallen victim to these hawks.  One begins to feel guilty about putting out bird seed and suet, not to mention maintaining birdbaths.  

This was the scene a few days ago:

Three hawks have been seen in the back yard in recent days; we were thinking there are a mating pair and one young hawk, but after studying images, I begin to suspect we have three juveniles.  We've been as close as 20 feet to these striking birds.  One young hawk made a swooping attempt at a squirrel--inexpert enough that the squirrel made it into the tree and hid himself in the Virginia creeper festooning the trunk and branches.  

All of the usual poses--preening, stretching....
and then a quick dash onto the ground in pursuit of something--most likely a grasshopper.  Wings are outstretched and raised.  (Sorry--that's the best shot I could get.)