Finding power in lessons from the pastJuneteenth -- the day Texan slaves found out they had been freed, two years after Abraham Lincoln issued the Emancipation Proclamation -- is June's favorite holiday. This year, though, her cousin Lillie will be there for the Juneteenth picnic. That could spoil everything. Lillie is used to celebrating the Fourth of July, like everyone else, and has no interest in Southern traditions. But Aunt Marshall, the girls'...