"Families of Mexico" documents a family from the port city of Veracruz. Hermaina's father and mother own an advertising agency, which her father manages. We see her mother teach a dance class at the city's cultural center, go food shopping, visit Hermaina's school, and follow her to her swimming lesson. Eight-year-old Brizia lives with her parents on her grandparents' farm. We visit her school and follow her and her friend as they visit the surrounding farms owned by her aunts and uncles, who are making tamales, harvesting cactus for salad, and sorting sesame seeds.