Children of Morta

Family Traits are the passive abilities you automatically unlock when you assign 4/8/14/20 skill points in a Bergson's skill tree. They are the leftmost skills next to the skill level gauge.
For example, spend 4 skill points in John's skill tree to unlock the "Of the Same Blood" family trait.
Simply put, spend 4 skill points for 3 different family members to unlock.