Halle Berry and Gabriel Aubry's daughter, Nahla Ariela, will be getting a brother or sister " if the proud papa gets his way. "She needs a sibling," Aubry told People at Monday's Callaway Golf Foundation Challenge to benefit the Entertainment Industry Foundation."I think it's important." "I've never known anybody who's had a single child [and] I've always been around big families," adds Aubry, who comes from a family of eight