Two images on same print. Caption reads: "Top: Home for Mexican-American farm workers in the lower Rio Grande Valley of Texas is a shack, usually overcrowded. Here three of Domingo Arredondo's six children play on the patio of their two-room tarpaper home outside Rio Grande City. Arredondo is president of the union which is trying to organize farm workers in Starr County. Bottom: `For the children, life will be better some day,' says Mrs. Herlinda Dimas, wife of one of the active union members. She is 21. Here she prepares a meal of rice, beans and tortillas -- staples in the field workers' diet -- in the sweltering kitchen of the Dimas' adobe hovel near Rio Grande City.