Personally speaking, a dog that has attacked every member of my family is not one I would attempt to rehabilitate with positive reinforcement.Just chiming in to say dominance theory is a very human-centric approach to explaining the actions of chickens, especially roosters, and modern studies disprove it. Please do not assume this has anything to do with aggression or trying to “dominate” you or “make you his hen”.
Sounds to me like he’s a good boy that has a very strong bond with you and is doing what he knows is the best way to take care of you - and that’s considering you part of the flock and enjoying your company (in all the ways a rooster might enjoy the company of another chicken).
The issue of his reluctance to accept new people into his “flock” can be addressed you would with a pet dog - slowly and gradually introduce people with lots of positivity and treat. Make people FUN!
Our feathered friends respond to positive reinforcement just as well as canines. And, similar to canines, responding to temperament issues with aversive and aggressive behaviors creates MORE problems and side effects you definitely don’t want.
Google a positive reinforcement based program for dogs that’s for people-reactivity and do your best to modify for your rooster while still keeping the PR principles. It’ll take time and patience but it’s an opportunity to grow your flock AND your family and potentially create some very awesome bonds. ^
There are plenty of roosters out there that need homes. I wouldnt take the risk of one with a history of violence around my family.