Brian McKnight's family drama reaches new petty levels! The "Back at One" singer's stepkids must be feeling the love, but what about his four biological children? Fans are calling out the R&B crooner for his #familydrama, but he's not saying a peep—maybe he's too busy scrolling through his stepdaughter's Instagram? 👀 The R&B singer shared a post about his stepdaughter making him a "girl dad" and being the "best daughter ever" when he has four adult biological children, including a daughter. #Di