Sheriff’s deputies following up on a reported domestic violence incident found the suspect the next evening behind a barn on Tomasini Canyon Road, bloody, inebriated and threatening his family with a baseball bat. John McFadden, 47, a gray-haired electrician from a historic ranching family, is being held on $300,000 bail. Last Thursday night, Mr. McFadden drove home to a trailer on the Martinelli Ranch, slightly intoxicated, and allegedly made demands for food and other items…