I think if they aren't biological, they take it on a case by case basis. For instance, if a kid is adopted at a young age, he can be a father/son, but if you adopt the prospective number 1 pick when he's 17, they won't let him be a father/son.Just been trying to find the rule on the afl website. No luck. Surely it doesn't discriminate in this way, it's a legal challenge waiting to happen.