From the U.S. Census Bureau’s Facts for Features: National Grandparents Day 2017:
“In 1970, Marian McQuade initiated a campaign to establish a day to honor grandparents. In 1978, President Jimmy Carter signed a federal proclamation, declaring the first Sunday after Labor Day as National Grandparents Day. To honor our nation’s grandparents, the U.S. Census Bureau presents statistics about their role in American society as caregivers of their grandchildren.”
From The American Presidency Project, Proclamation 4580—National Grandparents Day, 1978:
“The elders of each family have the responsibility for setting the moral tone for the family and for passing on the traditional values of our Nation to their children and grandchildren. They bore the hardships and made the sacrifices that produced much of the progress and comfort we enjoy today. It is appropriate, therefore, that as individuals and as a nation, that we salute our grandparents for their contribution to our lives.”
Source: 2018 American Community Survey (ACS), 1-Year Estimates.
Source: Current Population Survey (CPS), 2020 Annual Social and Economic Supplement.