Father's Day is a day to celebrate all kinds of father figures, no matter the biological relationship. 。

That's why Twitter user Caitlyn and her sister decided to celebrate the big day by surprising their stepdad, and making his fatherhood to them officially legal. She posted this video of them gifting their dad adoption papers and, well, get your tissues ready. 。

Tweet may have been deleted 。

The look on this dad's face says it all. He looks as happy to be their dad as they are to have him. Even the family pup is excited by the big family news.。

Mashable Top StoriesStay connected with the hottest stories of the day and the latest entertainment news.Sign up for Mashable's Top Stories newsletter。By signing up you agree to our Terms of Use and Privacy Policy. 。By signing up you agree to our Terms of Use and Privacy Policy.。

Thanks for signing up!。

People on Twitter fell hard for this family, and collectively shed tears of happiness for their new, legal bond.。

Tweet may have been deleted
。

Tweet may have been deleted 。

Tweet may have been deleted。

Tweet may have been deleted。

Tweet may have been deleted 。

Tweet may have been deleted
。

Tweet may have been deleted。

Tweet may have been deleted。

---

This thoughtful gift definitely made us a bit misty, too. But the other question here is: does that great pup get in on the happy adoption? We must know. 。

---

Featured Video For You 。

---

These solar panels are actually creating drinking water out of thin air
。

TopicsFamily & Parenting。