Ever wonder what Roger Federer's children do while he's busy breaking records?

His two sets of twins are on tour with him—eight-year-old's Myla and Charlene and three-year-old's Leo and Lenny.

In Indian Wells, Federer and his wife Mirka rent a house so the children are comfortable.

"You get used to certain routines and you like to know where their bedrooms are ahead of time," Federer said.

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When they're not courtside watching their father's matches, they're keeping busy at home.

"Here it's jumping in the pool, selling lemonade on the side of the street. They made $70 yesterday."

That's right, $70. That's certainly impressive.

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