@Sister
We think she had been there for a good week because we could hear her call but could not see her. The gum tree is in the centre of our 2 way driveway. All year the parent birds and last year's chicks roost in the shed up on the big steel girders.
It is lovely to watch the newly hatched chickies change from fluffy white downy little balls into fully fledged owls. First you see 2 black eyes in a ball of white fluff staring down at you.
The funniest part is when the nestlings are trying to be a branch but cannot resist swiveling their heads to watch you walk past. Mum / Dad hiss at them.
The adults will raise this clutch and then in January (depending on the wet season and food available) sit again. Some years all chicks will survive and some years none.
They have been on our block for over 10 years - same tree - same branch - same piece of bark.
I will post photos of mum and hatchlings.