Michael J Fox and his wife Tracy Pollan advised their son Sam Fox and his wife Molly Milstein to laugh at something daily if they want a long-and-happy marriage.

The actors said humour was the secret to their 37-year marriage, and they hope it will work for their eldest child and daughter-in-law.

Tracy - who met Michael on the NBC sitcom Family Ties in 1985 - told People: "The one thing actually that I would say that's the most important thing is find something to laugh about together every day, if you can."

Speaking about laughter being the secret to her and Michael's relationship, Tracy added: "You know what, we just take it one day at a time and it's worked.”

Sam, 36, and Molly quietly tied the knot in an intimate ceremony held in New York City in October, which the smitten couple a

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