“Happy Birthday to my big bouncing baby boy @palekidd you are the best. Proud to be your pops. Love you!” Michael wrote in his caption as he paid tribute to Sam, who he shares with wife Tracy ...

"Happy birthday to my big bouncing baby boy," he wrote in the caption. "You are the best." "Proud to be your pops," he added. "Love you!" In one of the photos Michael J. Fox shared in the post ...