More teens are getting hooked on gambling. Parents say it often goes undetected

Kim Freudenberg, a longtime teacher in San Francisco, knew that raising two boys meant a lot of hard conversations. She warned them about all the usual dangers: drugs, alcohol, sex, social media, riding a bike without a helmet. "Never once did I even think that I needed to say 'gambling,'" she recalls. One day, when her oldest son was 11, he was watching someone play video games on a livestream and clicked on a link in the comments. It took him to an offshore online casino. There, he got sucked in — to blackjack, poker, roulette. He could use items...