Where have they gone?

Mia used to spend a lot of time at the window watching the blackbirds build their nest in the clematis, then watching the mummy bird go in and out tirelessly with food.
We never saw any young ones fledge, but we did find one young blackbird dead in our garden water bowl ten days or so ago. I think it fell in when the water level was low and couldn’t get out. I hope it wasnt the only young one. Parents are still around singing but no sign of young ones.
Mia went out the window this morning and as you can see, she also is puzzled as to why there’s no longer any chirping.