Reiner was introduced to his future wife, photographer Michele Singer, while directing When Harry Met Sally. The meeting not only resulted in his decision to change the ending of that film, but he also married Singer in 1989. They have three children, Jake (born 1991), Nick (born 1993), and Romy (born 1998). In 1997, Reiner and Singer founded the "I Am Your Child Foundation," and in 2004, they founded the "Parents' Action for Children," a non-profit organization with a dual purpose: a) to raise awareness of the importance of a child's early years by producing and distributing celebrity-hosted educational videos for parents, and b) to advance public policy through parental education and advocacy.