They are social birds.. but, if you also have chickens or guineas, that will "work" for them too, especially if the son grew up with these.
Usually it is just fine to have one.. especially if kept in a pen and not loose.
However if he is loose and there are other peafowl within hearing range, there is a small chance he may go off and visit them. I often have peafowl belonging to other people coming here for a visit because they hear my own peafowl.