Rates of Type 1 diabetes are rising, and diabetes management often deteriorates during adolescence. Adolescent disclosure to parents is a key factor for effective diabetes management, and parent affective responses to disclosures affect the timing of future disclosures in healthy populations, but no studies to our knowledge have examined parent affective behaviors that facilitate or inhibit disclosure in the context of managing Type 1 diabetes. The present study examined how observed parental affective responses to adolescent disclosures predict the timing of subsequent disclosures during a discussion task in a sample of adolescents with Type 1 diabetes and their parents (N = 66 dyads). Generalized linear mixed models were used to test whether increased or decreased levels of parent affect relative to their emotional baseline response to adolescent disclosures predicted the timing of subsequent disclosures. Adolescents took longer to disclose again when parents responded to prior adolescent disclosures with higher levels of anger and of positive affect relative to their baseline levels of these emotions. Findings suggest that parental affective responses to disclosures have implications for adolescent disclosure in the context of chronic illness management. (PsycInfo Database Record (c) 2023 APA, all rights reserved).