AimsThis study examined the perceptions of the SHARE plus intervention and its effects on communication, collaboration, and involvement in day‐to‐day diabetes management in older adults with Type 1 diabetes (T1D) and their care partners.BackgroundThe SHARE plus intervention includes continuous glucose monitoring with a data sharing app that allows care partners to view glucose data on a smartphone and receive alerts. People with T1D and their care partners are educated about communication strategies, problem‐solving strategies, and action planning when using glucose data sharing.DesignQualitative descriptive design.MethodsOlder adults with T1D wore a continuous glucose monitor for 3 months (n = 10). Care partners (n = 10) used a data‐sharing app. The SHARE plus intervention consisted of one 90‐min education session. Semi‐structured interviews were conducted across 10 dyads (person with diabetes and care partner) following the 12‐week study. A qualitative description and a constant comparison approach were used to examine similarities and differences in experiences. Interviews were transcribed, coded, and analysed for common themes. The manuscript adheres to COREQ EQUATOR checklist.ResultsThe SHARE plus intervention increased diabetes knowledge across the dyads, improving confidence and helping partners understand how to navigate symptoms and behaviours and when to intervene. Dyads worked together to optimise diabetes management through improved communication, collaboration, and management of disagreements. Although the majority of persons with diabetes and their care partners reported no conflictual communication, disagreements about diabetes management remained in some dyads. The SHARE plus intervention impacted care partners in various ways from a psychological perspective. While live‐in‐care partners felt peace of mind, care partners living away from persons with diabetes had some increased worry and concern.ConclusionThe SHARE plus intervention results can help guide future development of diabetes dyadic care and education interventions using diabetes technology.Relevance to Clinical PracticeThe SHARE plus intervention is a brief, practical intervention that can help diabetes clinicians improve communication and collaboration among spouses living with older adults with T1D who use continuous glucose monitoring with data sharing.Patient ContributionA person with diabetes was part of the research team and assisted with design of the intervention and subsequent interviews and analysis.