Adults with intellectual and developmental disabilities (IDD) have been historically excluded from participating in aging-focused research, continue to experience barriers accessing appropriate health care, and encounter distinct challenges as they age compared to people without IDD. These challenges and their effects often extend to their immediate support system, including family caregivers, including parents, siblings, and other kin. Family caregivers, often in the role of 'perpetual caregivers,' can struggle to support aging adults with IDD as they also concurrently experience the effects of their own aging, potentially hindering their ability to provide lifelong care. As parents age, the burden of care may shift to others within this support network such as siblings who, due to various constraints (e.g., geographic location, personal obligations, and financial restrictions) can also experience challenging caregiving responsibilities. Research on the mental health of family caregivers has predominantly focused either on the impact of caregiving among parents of people with IDD (and to a lesser extent on siblings) or on late-life caregivers of aging adults without IDD. This leaves a significant gap in understanding how to support caregivers during mid-late adulthood as their family member with IDD ages or as they themselves undergo age-related changes. 
 In this paper, we provide a brief overview of research on family caregiving of older adults with IDD, followed by a description of a national effort, The Brain Health-IDD initiative. This initiative aims to develop strategies that will support the promotion of brain health in aging adults with IDD and their family caregivers. As part of this effort, family caregivers, both siblings and parents of adults with IDD are working together with researchers and clinicians to co-design, co-deliver and evaluate a virtual education program for families. 
 The paper concludes by reflecting on the program's importance from the perspective of sibling and parent caregivers. This inclusive approach emphasizes the broader responsibility of supporting families navigating the challenges of disability and aging in mid-late adulthood, highlighting the need for support and awareness across all levels of care. 
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