Quote of the day by Roger Federer: "I'm as patient a father as I am on the tennis court. It takes a lot for me to get really upset, but…" - what the tennis legend's honest parenting confession teaches us about patience

• Roger FedererRoger Federer built an entire reputation on staying calm when everyone around him expected him to crack.
• Off the court, raising four children including two sets of twins, he admitted the calm has limits.
• "I'm as patient a father as I am on the tennis court," he said.