When you say:
"Dang. So if I am having an Event with FamilyOne, I can't pick the same object from FamilyTwo by its UID or anything? Thanks"
Do you mean there are various objects assigned to two familed. Something happens to One object from FamilyOne. You want to pick that object to then apply events applicable to FamilyTwo for that object?
Or do you mean, if FamilyOne and FamilyTwo collide and the objects are both assigned to FamilyOne and FamilyTwo, how do I identify between them?