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CHICAGO – A man sank to the ground and broke down in tears when his girlfriend’s daughter asked to be officially adopted at her graduation party.

Last weekend, friends and family gathered to celebrate Lauren Hernandez’s graduation.

In a video posted to YouTube, Lauren hands her soon-to-be dad a box. Joe Losco has been dating her mom for 17 years.

“He’s been there for everything for me,” Lauren told WBBM.

Joe unwrapped the box to find a framed poem inside, along with adoption documents that would make Lauren his daughter forever.

When he realized what was going on, he broke down in tears.

“I’ve wanted nothing more than to be her dad from day one,” said Joe.

The family said they were thrilled to make the adoption official.