"They've been under incredible stress for five months, give them a break," Errol Musk said while attending a forum by Putin's ultranationalist ally in Moscow.

The row between Elon Musk, the world's richest man, and U.S. President Donald Trump was triggered by stress on both sides and Elon made a mistake by publicly challenging Trump, Musk's father told Russian media in Moscow.

There's an old saying that the easiest way to make a billion dollars is to start off with a million dollars. It doesn't apply to every billionaire, but it partly explains why both Elon Musk