The family of a 20-year-old stock trader who committed suicide sued the broker Robinhood for his death, citing its “misleading communications” that caused their son to panic over what he wrongly believed were huge market losses, according to a lawsuit. Robinhood notified Alex Kearns in June of what he thought was a $730,000 loss on a trade, and when he was unable to communicate with anyone at the company, the college student was thrown into a highly distressed mental state, the lawsuit stated. As a result, fearing he had obligated his family to repay the huge loss, he ran in front of a train and killed himself, according to the lawsuit, filed in California state court. “We were devastated by Alex Kearns’ death,” said a statement from Robinhood, which added that it was improving its educational materials and more live support staff, among other changes. Monday’s lawsuit said Robinhood has …