Peregrine Life #12

A fine pair of juvenile peregrines but are they related ?

On the 10th June I reported that the first peregrine of 3 young had fledged on the previous day only to get himself grounded after being attacked by magpies. With the help of DWT the peregrine was rescued, taken to a vet for checking and delivered in his carrying box back onto the roof of the mill, which is the family home. He then hadn't been seen for days and there were concerns that he had died after the  trauma. But then on 15th June the good news was that all 3 juveniles were seen together on the side of the mill, all had turned out well, or had it.

Whilst I was on holiday last week a maintenance man had reported a dead peregrine in a box on the roof ! He bought it down and a fellow watcher took the bird to the DWT for investigation but it was decomposed to far to find the reason for death but for sure it was fledgling #1. So how do 3 juves turn into 4? The riddle was solved when later the DWT reported that a Notts juvenile peregrine had been released in Derbyshire by a different vet, he must have found his way to the mill and amazingly had been accepted by the family. All 3 juveniles stay close by, preen each other and generally play together. The parents ensure they have prey delivered to share. All of which is amazing as the adults have always chased everything else away, including the occasional passing peregrine. 

So which one is adopted? I will try to snap all 3 together to see if anyone can tell.