The Adoptive Parentage alternate racial trait for Humans is supposed to grant a weapon familiarity and language, but apparently it does not allow to pick a Parentage because it does not recognize the Adoptive Parentage Special Ability. I think it's not tagging the character as having that ability.
Just a quick note - Pathfinder (Beta) would not be possible for you to get any issue in 6.0+. That is referring to an out of cycle set that was made for the Pathfinder core rules during their playtest beta cycle. The Gamemode you use is what that should match. Thanks.
Completed: At revision: 24858