In Brazil, research indicates that primary family members are the main source of support for individuals with chronic conditions such as hypertension (HTN). The burden of caregiving not only hinders effective HTN management but can also cause stress and anxiety, potentially leading to HTN in caregivers. Despite this, few studies have explored the impact of caregiving on these family members. Aims of the study were to: (1) Describe the prevalence of blood pressure (BP) control in family members of individuals with HTN; (2) identify family member perspectives on facilitators and barriers to HTN management; and (3) identify influences that help or interfere with family member functioning (levels of stress, quality of life [QOL], and caregiver burden). This descriptive, cross-sectional study included 213 family members randomly selected from 3 Family Health Strategy units. Family members were largely female ( n = 143; 67.1%); the mean age was 60.1 years ( SD ± 17.02) and 42.6% ( n = 96) had less than a high school education. The three most important facilitators and barriers were related to medication, medical visits, healthy eating, physical activity, and stress. The mean systolic BP was 132.7 ( SD ± 21.9) mmHg and a diastolic BP of 85.9 ( SD ± 18.1) mmHg with 120 (56.3%) of family members classified as having normal BP. In regard to family member contributions to the self-care of the individual with HTN, family members displayed low levels of self-care maintenance ( n = 148; 69.4%) and management ( n = 47; 71.2%) support, while a slight majority ( n = 114; 53.5%) had adequate levels of self-care confidence in supporting the individual with HTN. Family members ( n = 189; 88.8%) showed moderate-to-high levels of perceived stress, but good physical ( n = 189; 88.7%) and mental QOL ( n = 196; 92%) and low levels of caregiver burden ( n = 113; 53.1%). A variety of contextual sociocultural influences were associated with the outcomes under study. Family-based interventions are urgently needed to address the inadequate management of HTN.