When the Chinese and US presidents met on Monday, their talks included not only world and bilateral issues, but also something about the family.

President Xi Jinping mentioned Barack Obama's wife and daughters by their first names and the US leader's mother-in-law by her surname to show respect.

"Before arriving in the Netherlands, my wife and I met and had pleasant talks with your wife Michelle, your mother-in-law Ms Robinson and daughters Malia and Sasha.