Since last October, roughly 60 people, including 18 children, have lived in the RV park on the Tacherra Ranch, a working family farm on Mesa Road that has provided meat, vegetables and eggs to the Bolinas community for over 100 years. Mostly laborers — on ranches, restaurants, construction sites, landscaping crews — they make up just 4% of the town’s population, but their children account for nearly 20% of the tiny K-8 Bolinas-Stinson Union School District.