(CNN)The bond between a father and his kids can be extremely powerful.
In sport, a dad's duties can range from shipping their kids to practice, buying the necessary kit and spending countless hours supporting their children.
During that time spent together, the relationship can deepen, and in the public pressure-cooker that is elite sport emotions can bubble over.
So on Father's Day, CNN Sport looks back at some memorable dad moments.
When up late watching TV one night in 1980, Richard Williams turned the channel to see Romania's Virginia Ruzici receive a check for winning a tennis tournament that he describes as "a hell of a lot of money for four days' (work)."
"I went to my wife and said that we have two kids, and we'll become rich. They're going to be tennis players," he said, referring to daughters Venus and Serena.
A 78-page blueprint was soon prepared, describing how Venus and Serena would reach the top. A key plank of the plan was that it would be enacted from one of America's roughest areas.