When parents Tammie and Josh Higgins found a set of four siblings up for adoption who amazingly matched up in age with their own four biological children, they couldn’t believe it.

“My husband saw their pictures online and was like, ‘These are our kids, I just feel it,’ ” Tammie, 36, tells PEOPLE. “We just knew it in our hearts.”

The couple had always talked about expanding their family through adoption and the discovery of Rudy, 14, Ruby, 12, Grace, 10 and Ruben, 8, online felt like “fate.”

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