Michael J. Fox is one proud dad! The actor celebrated the 34th birthday of his son, Sam Fox, on Instagram on May 30. "Happy Birthday to my big bouncing baby boy @palekidd you are the best," Fox wrote in the caption. "Proud to be your pops. Love you!" The "Family Ties" star, 61, shared a photo of his son, who is an actor and producer, blowing out th...