Sister Wives star Maddie (Brown) Brush is expecting her first baby with husband Caleb

Maddie Brown is having her first baby!

The Sister Wives star and her husband Caleb Brush are expecting their first child together in May, the couple confirms exclusively to PEOPLE.

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“We are both really excited and anxious,” says Maddie. “I think every soon-to-be parent is anxious, but we have so much support from both sides of our family.”

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As far as what the baby will call all four Sister Wives is still up for discussion.

“We think it would be super cute to have different names for all the grandmas, like oma, grams or babicka,” Maddie says. “Grandma said differently or in different languages. Ultimately they get to choose what they are called but my dad [Kody] will probably be grandpa.”

Maddie’s father and his four wives have a combined 18 children, but this will be the first grand baby for the family.

For more on Maddie’s first pregnancy, pick up the latest issue of PEOPLE, on newsstands now

As their due date creeps closer, Maddie and Caleb have already decided the kind of parents they want to be.

“I think I’ll be the disciplinarian parent just because Caleb already has such a soft spot for the baby,” says Maddie. “He already ha so much love for the baby.”

And Caleb has no problem taking on that role. “I’m going to be the pushover,” he says. “Our child is going to have me wrapped around its finger.”