In 1970, Marian McQuade began a campaign to establish a day to honor grandparents. In 1978, Pres. Jimmy Carter signed a federal proclamation, declaring the first Sunday after Labor Day as National Grandparents Day. It’s been celebrated since then.
The U.S. Census Bureau offers this information about American grandparents:
The number of grandparents whose grandchildren under 18 years old were living with them in 2013.