This isn’t your typical “how to stop the fighting” advice.

Sibling rivalry isn’t just about fighting over toys or who gets the front seat. Dr. Becky, the clinical psychologist behind the “ Good Inside ” YouTube series, believes sibling rivalry isn’t necessarily a problem. It’s a training ground for lifelong relationship skills.

First, let’s understand how and why adding a new sibling can turn your firstborn’s world upside down.

“Imagine you come home. I would come home to my husband, and this is what he would say to me: Becky, I have amazing news to share with you, OK? I’m getting a second wife,” Becky said. “You’re going to be big wife, and she’s going to be little wife, and you guys are going to be best friends, and it’s going to be amazing, and we’re going to be one big, happy fami

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