Family caregivers' views and experiences related to treatment usage processes by their adult relatives with serious and persistent mental illness (SPMI) were empirically examined in a sample of Latino caregivers (n = 17) who were users of services at the National Alliance on Mental Illness (NAMI) in a predominantly Latino- (80%) and Mexican-descent large city in the Southwest United States. We conducted a stability check of qualitative findings with a second sample of Latino caregivers with no exposure to NAMI (n = 15). Overall, the combined sample (N = 32) compared similarly with larger samples of Latino adults and caregivers in quantitative measures of acculturation, familism, caregiver stigma, and depression symptoms. Together, caregivers' stigma and cultural beliefs, such as verguenza (shame), use of folk healers, and lack of insurance, were major reported barriers to service usage. Family support (and lack of) for treatment also weighed heavily as a facilitator (and a barrier) of service usage, thus highlighting the complexity of family relationship contexts. Substantial portions of caregivers reported that treatment initiation was prompted by psychiatric hospitalization (50%), and that positive experiences with service providers were influential in treatment retention (72%). Given the high levels of family involvement reported among Latino caregivers, the findings underscore the potential role of family caregivers in treatment engagement and retention. Future research is needed that examines family caregivers' role in treatment with models that consider the interplay between cultural background, family level relationships, and service system contexts.