Elon Musk, left, and Lyndon Rive at launch of SolarCity’s initial public offering on the Nasdaq Stock Market in 2012. Associated Press Elon Musk and his cousin, Lyndon Rive, have always been close. Their mothers are twins, and Messrs. Musk and Rive grew up together. “We’ve known each other for as long as we’ve been conscious,” said Mr. Musk, speaking at a panel this week at a private conference in New York. There is an obvious, almost brotherly affection between the two men. Mr. Musk says Mr. Rive “is an awesome guy and really hardworking and driven, and you can trust him with anything.” And when Mr. Rive recounts the drive to Burning Man in 2004 when Mr. Musk told him his next venture should be in solar power, Mr. Rive says that when Mr. Musk tells you what area to get into next, you get into it. Their […]