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\"Proud to be your pops,\" he added. \"Love you!\"

In one of the photos Michael J. Fox shared in the post, Sam Fox can be seen blowing out candles on a birthday cake. Two others show the father and son smiling for a photograph with a waterfall behind them.

Michael J. Fox shares his son with wife Tracy Jo Pollan, who is also an actor. The couple also have three daughters: twins Aquinnah Kathleen Fox and Schulyer Frances Fox, both 28, and Esmé Anabelle Fox, 21.

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