The purpose of this study was to evaluate the effects of a nurse–family partnership model on the self-efficacy of family caregivers (FCs) and the incidence of catheter-associated urinary tract infection (CAUTI) among patients. A randomized controlled study was conducted. We recruited 61 patients and their FCs, who were randomly divided into an experimental group (n = 30) and a control group (n = 31). In the experimental group, the main caregivers comprised a nurse–family partnership, whereas the control participants received routine care. The findings were as follows: (i) the incidence of CAUTI was lower in the experimental group than in the control group (20% vs. 38.8%), but the difference was not statistically significant; and (ii) no significant difference emerged for reported Caregiver Self-Efficacy Score between the two groups. The nursing team and FCs must become partners in cooperative caregiving to enhance the quality of patient care.