Mention the names Sintao and Eugene Heung to any adult who grew up in Nevada City, and most likely, you’ll get a smile. The former owners of The Bonanza Market on Broad Street were honorary family to many. Eugene, a butcher, was famous for giving out free hot dogs to children, and Sintao kept a watchful eye on the town’s young people as if they were her own. “I told the kids, ‘If you steal candy, I’ll tell your parents,’” she said with a laugh. “I ran into a man recently who said, ‘Years ago you made me get a …