Haven't played 12 that long, but in 11 I never got a son in my two 40 year careers. Could be because I read somewhere that if you put international footballer as your reputation then it's easier to get a son. I put Sunday league footballer in both. Then in a smaller save I played, Hangeland, after retiring, took the Cologne job and got a son with Brede in his favoured personnel. It does not happen that often.