Before the days of community-supported schools, parents were the primary reading teachers of their children. This was, of course, if the parents could read themselves. Once schools became established, parents generally relinquished the responsibility for teaching their children to read to the schools. Despite the fact that today most parents know how to read, too often they take a very inactive role in their children's reading development.
Klein, A. E. (1978). Parent Involvement in Children's Reading Readiness Development. Reading Horizons, 18 (4). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol18/iss4/6