It rained pretty heavily during the whole weekend and I was a little concerned that the nests might be affected in some way, well it appears that one of the squabs is gone. Did it fall out? Was it a cat's lunch? or was it ready leave home early? I'm not sure. All I know is that when I went to check, only one squab was perched near the nest.
Later on in the day I noticed the squab in the garden following a grownup learning how to find food. After that they roosted for a while on top of the neighbor's shed.
The nest is now empty and the squab born only last week has taken wing.