My big Amrock rooster stopped feeding his three sons some 4-6 weeks ago and started to chase them away from feed and his favourite hens. The sons will be 26 weeks old tomorrow.I have the same rooster scenarios here. One is a Black Sex Link that turns on the charm calling the hens when I give him a treat. He drops it on the ground for them. Other roosters gobble it down. He has several sons that look like him and 3 of them hang out with him. They are almost as big as he is now and he feeds them. He won't feed other roosters though. I'm just surprised he feeds sons who have sisters laying.
But I suspect the wild one to be the son of his half brother whose character was pretty nasty even with the hens. As soon as I butchered him, peace was restored among the flock and all the hens relaxed noticeably.
So his suspected son will follow suit soon.