Why Mia Farrow’s best advice to her son is motherhood in a nutshell

What is the best piece of advice Mia Farrow ever gave her son? We've got the answer.

Ronan Farrow isn't the only big name in the Farrow household. His mom, Mia Farrow, is a big-time actress (Rosemary's Baby, Hannah and Her Sisters, The Great Gatsby) and instilled some of the wisdom she learned along the way into her son. Here, on Mother's Day, Ronan shares the best piece of advice he learned from her. Ronan Farrow's new book is War on Peace: The End of Diplomacy and the Decline of American Influence.