Disclosure to parents and reasons for not disclosing different activities were examined in 489 Chinese, Mexican, and European American adolescents (M = 16.37 years, SD = 0.77). With generational status controlled, Chinese American adolescents disclosed less to mothers about personal and multifaceted activities than European Americans and less about personal feelings than other youth, primarily because these acts were considered personal, not harmful, or because parents would not listen or understand. Disclosure regarding prudential behavior was lower among Mexican American than among European American adolescents, primarily due to concerns with parental disapproval. Multigroup path analyses indicated that greater closeness to parents is associated with more disclosure for all youth and activities; associations between family obligation and disclosure varied by domain and ethnicity.