Ben Affleck and Jennifer Lopez are redeveloping her Bel Air home.

and they've got a surprise in store for their own children. 

According to HollywoodLife, the couple is allowing their children to personalise and design their own rooms from scratch. 

which is a "fun family project" that they're all very excited about.

The couple will live in the $28 million mansion with Lopez's 14-year-old twins Emme and Maximilian. 

"The house is on 8 acres in Bel Air; it doesn't get any stronger than that," said another insider to HollywoodLife.

Jennifer Garner lives in Brentwood, and the grounds are like a park.

which is approximately 20 minutes away, so the location is also suitable in that regard. 

It is perfect because everything that needs to be changed can be done during this renovation."

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