The Bennet family and the Cortez family weren't biologically connected. Their only link was that Penny and Nina had been swapped as children. Penny grew up in the Cortez family, under her aunt Jessa's care, for the first thirteen years of her life, while Nina was raised in the Bennet family.
Until the truth about the swap came out, the two families had no connection.
But once they learned what had happened, a bond formed between them.
Fortunately, both families got along well with Allison — Atlas's mother — and Jessa ended up opening a restaurant with her, which they still run to this day. Because of that, they came to see each other as family.
Jessa had two children: the twins, Yugi and Yuri.
Yugi worked for Penny's company and ran an entire department there. In fact, he was also one of the company's shareholders.
