Sign Language en Español???!!!

Does anybody have any idea at all whether or not ASL (American Sign Language) is also used in Mexico? From what I can find it is called "Lengua de Signos" in Spanish, but Hector doesn't seem to know anything about it! He didn't even know how to say it...I guess that's part of him being in America for more than half his life!!

If there is a difference, I really wanted to try to find a book on it in Spanish to take with us to Mexico, since right now that is the only way my son knows how to communicate, I think his Abuelitas would be more than happy to have it!

If ANYBODY can help me out...PLEASE by all means do! I would really appreciate it, and I know that some of these other womans husbands actually "grew up" in Mexico, and Hector spent his teenage years here! Thank you everyone! Gracias a todos!

~Jenn;0)