The family that...
Family that plays together, stays together.
I don't know who coined that phrase. But it's obviously a variant of this one:
FAMILY THAT PRAYS TOGETHER STAYS TOGETHER, THE - "Religious families are less likely to disintegrate. Originated by commercial writer Al Scalpone and used as the motto of the Roman Catholic Family Rosary Crusade by Father Patrick Peyton. It first saw print on April 3, 1948, in 'St. Joseph Magazine' (Oregon)..." From the Random House Dictionary of Popular Proverbs and Sayings by Gregory Y. Titelman (Random House, New York, 1996).