Yes, the chicks are with their mum. And I believe he is identifying the male ones. Today I was around when he attacked the little one I believe is male too; it's weird though, it's random, and he is most of the time grazing with the hen and the chicks...
The problem is there is only her on the backyard and apparently she is about to lay eggs again... I thought about lending a hen from a neighbour to put together (as he is not flying on the neighbour's backyard to look after their hens since the chick were born) in order to calm him a little and avoid putting a saddle on her back... lol
On the other hand, as he sleeps on a lemon tree and we lock her with the chicks till morning, during the day, we are able to hear if there is something wrong on the backyard...
Thanks for the help...
Regards,