Grandparents fill a major gap in child care in this country, care that is otherwise unavailable or unaffordable to many. Grandparents in the U.S. care for 1 out of 4 children under the age of five. As such, they are a major influence on young lives, tied with formal child care in the number of children served. In the spring of 2018, ZERO TO THREE and its partners at the Bezos Family Foundation and the David and Lucile Packard Foundation commissioned a national survey of grandparents who care for grandchildren aged five and under. We believe this survey to be the first of its kind to capture the needs and experiences of grandparent caregivers. (author abstract)