Often referred to as one of the most famous sports mothers of all time, Gloria Connors—who herself competed professionally in 1942 and 1943—began coaching her oldest son Jimmy in 1954 when he was two years old. She remained his primary coach for much of his 21-year career, often with her mother Bertha Thompson by her side, whom Jimmy called “Two Mom”.

Melanie Molitor and Martina Hingis

Molitor, a former player from the Czech Republic, also began coaching her daughter Martina Hingis—named after national Czech hero and 18-time Grand Slam singles champ Martina Navratilova—at age two. Hingis became the youngest No. 1 player in tennis history at 16 years and five months!