She may be their only child for now, but 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 at the Riviera Country Club in Pacific Palisades, Calif., 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 children. “I believe in big families.”

And what does Berry, 42, think of his plans to expand the family?

“She’s okay with it,” he says. “Absolutely.”

As for baby Nahla, who turns 1 in March, Aubry says the toddler is walking and talking, and even practicing a second language.

“I don’t want to say [what her first words were] but it was probably ‘dada,’ ” he says. “She doesn’t say ‘dad.’ She says ‘papa,’ which is the French version of it.”

But to not hurt anyone’s feelings, says Aubry, “Let’s just say she said, ‘mama.’ “

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