Parents are often unsure about how to help their children at home, and this is particularly true of the parents of English language learners, who may feel that they have nothing to offer their children if they themselves do not speak English.
As you know, however, there are many things that parents can do, and Colorín Colorado can help you communicate that to your Spanish-speaking parents. The website was originally designed as a bilingual resource to help Hispanic parents support their children in learning to read. The "For Families" section is available in both English and Spanish, and it has lots of great information that can be printed in Spanish and sent home to parents who do not have Internet access. Perhaps your school has a Spanish-speaking teacher or parent volunteer who could communicate the information orally to parents who are not able to read?
The "For Educators" section on Colorín Colorado also has a section on "Reaching out to Hispanic Students and Families," where you can find more ideas about how to get your students' parents involved, including a free downloadable handbook and video clips in both Spanish and English.