In 2020, around two million grandparents were responsible for the basic needs of their grandchildren, with grandparent care concentrated in historically disadvantaged communities. Despite being particularly vulnerable to financial insecurity, most grandparents are ineligible for formal support -- such as subsidies for foster parents, housing assistance, and Social Security dependent child benefits -- because they raise their grandchildren outside of the foster care system. Using the Health and Retirement Study and American Community Survey, this study documents how grandparent caregivers differ from typical grandparents in terms of time and money spent on grandchildren, demographic characteristics, and economic resources. It then evaluates how their finances would improve if eligibility for child benefits were aligned with the more lenient tax criteria for claiming a dependent grandchild.