It was just yesterday that Chelsea Clinton revealed the adorable name of her newborn baby boy with husband Marc Mezvinsky: Aidan Clinton Mezvinsky.

NEW YORK, NY - NOVEMBER 10: Chelsea Clinton (L) and Marc Mezvinsky attend the Glamour 2014 Women Of The Year Awards at Carnegie Hall on November 10, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Glamour)

Today the mommy of two and her newest little family member are celebrating a very special Father’s Day (as is Eddie Redmayne!) with both husband Marc and dad Bill, with Chelsea taking to Twitter once again to share the first photos of her baby boy.

Not only did she post this super sweet moment with her own newly completed brood (minus one daughter Charlotte), she reposted Bill’s tweet of this heart-melting photo of the child with his dad and his grandpa for Father’s Day.

Hillary also got to meet her new little grandson, as she shared with the world in this sweet post.

And don’t worry — there’s also a Bill dad throwback for your enjoyment, as seen on both Hillary and Chelsea’s pages, ’cause who DOESN’T want to see the former president and current presidential hopeful in Donald Duck garb?

Happy Father’s Day to you all!

Which snap of the new little tyke is your favorite? Share with us over @BritandCo!

(h/t E!, photos via Michael Loccisano and Dimitrios Kambouris/Getty)