Grandparents as the informal childcare reserve

National survey and cohort data show grandparenthood is widespread among older Americans (about two‑thirds of those 65+ were grandparents in 2024 and the typical grandparent had several grandchildren), suggesting a large informal childcare and support resource that policymakers and employers rely on but rarely account for in childcare or eldercare planning. Recognizing grandparents as a constrained resource reframes debates over childcare supply, eldercare burdens, and labor‑market flexibility for parents and older workers. — If grandparents provide a substantial share of day‑to‑day childcare, policy choices (childcare subsidies, retirement age, elder support) should account for limits and inequities in that informal capacity.