Pick up the phone or drive over for Sunday dinner, because Sunday is National Grandparents Day. An observance celebrated every September, National Grandparents Day is a tradition that was started in the '60s but today is simply a chance to honor your elders.

Even United States President Barack Obama endorses the holiday. In a proclamation last year, Obama wrote that grandparents were "quiet heroes" whose sacrifices everyone should appreciate. "We owe so much of who we are and what we have to our grandparents," he said. "With grit and dedication, they helped define a new age and open doors of opportunity for us all."

On Sunday, share these quotes collected from the Quote Garden, QuoteZine and Goodreads about grandparents with your family:

"Surely, two of the most satisfying experiences in life must be those of being a grandchild or a grandparent." — Donald A. Norberg

"Grandmothers always have time to talk and make you feel special. " — Catherine Pulsifer

"If you're lucky enough to still have grandparents, visit them, cherish them and celebrate them while you can." — Regina Brett

"That's what people do who love you. They put their arms around you and love you when you're not so lovable." — Deb Caletti

"Nobody can do for little children what grandparents do. Grandparents sort of sprinkle stardust over the lives of little children." — Alex Haley

"A house needs a grandma in it." — Louisa May Alcott

"There is no greater achievement than being a grandfather who tells fairytales to grandchildren." — Eraldo Banovac

"Elephants and grandchildren never forget." — Andy Rooney

"Everyone needs a house to live in, but a supportive family is what builds a home." — Anthony Liccione

"When grandparents enter the door, discipline flies out the window." — Ogden Nash

"You are born into your family and your family is born into you. No returns. No exchanges." — Elizabeth Berg

"A grandmother pretends she doesn’t know who you are on Halloween." — Erma Bombeck

"The simplest toy, one which even the youngest child can operate, is called a grandparent." ― Sam Levenson