And then there were Four

Yesterday we didn't see much adult Kestrel activity at all and Sue became worried that they might have been abandoned.
So great excitement this morning when Sue, out watering, came rushing to find me saying, 'They've flown!'  And on the roof of our barn some 25m behind the house sat 2 kestrels, looking very pleased with themselves.  I quickly took some photos.

The third kestrel was still in the nest hole and there was calling between the young.  Then suddenly there were 3 on the roof.

I called to Sue, telling her that all 3 were out, but she said 'there's one in the nest!  So ... we now have 4 young.

At the moment the 3 on the roof are all just sat there as if to say 'OK, we've flown.  So what?  What next?'