Assimilation patterns are different today than when your grandparents probably arrived.
The only first generation folks who ever acculturate into the U.S. came here when they were under 12. The rest never quite leave the old country behind. Their kids, however, are always Americanized, including speaking English (which alot of Freepers refuse to believe). This is as true of the Colombians/South Americans who were my neighbors in Miami, as it is for the Chinese and Middle Eastern kids who were my neighbors in SW Brooklyn.