Michael J. Fox celebrated his eldest child's birthday The veteran actor shares son Sam and daughters Aquinnah, Schuyler and Esmé with his wife Tracy Pollan The couple have been married since 1988 Michael J. Foxis wishing his eldest child a very happy birthday. "Happy Birthday Sam…No better friend, brother, or son on the planet. Love you so much," theBack to the Futurestar, 63, wrote as the endearing caption to a Friday, May 30Instagrampost. In it, he andSam Michael Fox, 36, stood side by side as the actor pretended to punch his son in the face. Sam, who was all smiles for the photo op with his famous father, is his only son. In addition to the birthday boy, Fox sharestwinsAquinnah Kathleen Fox, 30, Schuyler Frances Fox, also 30, and Esmé Annabelle Fox, 23, with his wife of over 30 years,Tracy Pollan. Fox'sBack to the FuturecostarChristopher Lloydleft a single red heart emoji in the comment section of the post. Mariska Hargitayadded, "Happy birthday, Sam!!!💖." Fans commented on how much the father-son duo resembled one another, with someone referring to Sam as Fox's "mini-me," but then adding, "Well... sorta…," likely due to the birthday boy being taller than his dad. Michael J Fox/Instagram Earlier this year, Fox and his family were present as theTeen Wolfalumreceived the Presidential Medal of Freedomfrom PresidentJoe Biden. In a 1998 cover story, Fox spoke exclusively to PEOPLE about living withParkinson's diseaseafter being diagnosed in 1991. During his time at the White House, he was recognized for raising awareness of the incurable degenerative disorder. "On behalf of the million or so people living with Parkinson's, and the millions more who love them, I am proud and honored to accept the Medal of Freedom from President Biden. No doubt I get the most attention in the PD community, but this is our fight and support and recognition on this level is a great boost," he captioned a Jan. 6post. Emma McIntyre/WireImage He concluded, "I still believe with all my heart we will eliminate Parkinson's disease and all who have joined in the fight will have played a part in the victory. Thank you. With Hope and Gratitude, Michael J. Fox." His family proudly smiled as they gathered for photos in his carousel. And though they're all supportive of each other, Fox has said in the past he doesn't think his girls have seen one of his biggest films,Back to the Future Part II. Never miss a story — sign up forPEOPLE's free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories. "I don't know if my daughters have seen it,"Fox saidduring aBack to the Futurepanel at Los Angeles Comic Con while discussing the movie's 1989 sequel. The father of four is known for his quirky fun with his family. "Our children are beautiful, sensitive, intelligent, empathetic, independent, compassionate, adventurous, lovely people. That's your fault," he quipped in a 2022 Mother's Day tribute to Pollan, 64. "We all love you so much. Happy Mother's Day." Read the original article onPeople