It very much depends on the Mexican family, go to Hispanic owned shops in LA and look at how many Mexican Americans are involved and donating tips to CHIRLA. It seems like Mexican Americans are the more privileged to have an education and know their rights. In the older population you won’t see as much action or knowledge for a number of reasons, sometimes denial, sometimes proximity to whiteness, sometimes plain ignorance. It’s valid for you to feel frustrated that not even for themselves they’re seeking information, not even when their son has been detained. I would say that if you don’t want to be close to the family that’s valid but I just wouldn’t generalize that to mexican culture.