Guadalupe Padilla, 74, of Pajacuarán, has seen eight of her 10 children settle in the United States, including Rosa Mungía, a farmworker who rents out her Toppenish basement to family and friends from Mexico. On a visit to her daughter, Padilla holds the youngest of her 36 grandchildren, Daniel Mungía. His Mexican mother gave birth to him in Washington. Because of a long tradition of migration between the United States and Mexico, many Mexican and Mexican-American families have deeper roots in the Yakima Valley than some of their non-Hispanic neighbors.