This new trait type allows you to inject a mechanical edge into the dynamics of your family. Unlike other trait types, you are not limited to a single family trait per character.
Many of these traits work only on a member of your family, or require another character with the same trait to be nearby for the benefits to apply. For a character to count as having the same trait, they must be your family member.
At the GM’s discretion, the “family” for some of these traits could in fact be another group with strong interpersonal ties and common interests, such as a martial arts school, army unit, mutual protection society, or criminal gang. In this case, however, they become Social traits, which limits the character to one trait.