(CNN) -- Revelers in the rainbow-washed crowd smiled and cheered this month as the little blond girl in the parade float pageant-waved to the B-52's "Love Shack." Next to the float, the girl's father, Billy Holder, handed out fliers to the Atlanta Pride Parade crowd. His wife, Melissa, carried a banner along with Jeremy Mullins, the couple's partner. "Polyamory: Having simultaneous close emotional relationships with two or more other individuals," read their purple-lettered banner, embellished with an infinity heart. ***** They've learned the need for discretion. They said a family member reported them to Georgia's Division of Family and Children...