This cute card for National Grandparents Day (Sunday, September 13th) features a colorful cartoon grandma and grandpa with their sweet young grandchildren. The message is simple but sentimental: “thanks for making us smile.” It means a lot to have two people in your life that love you so much, which is something worth celebrating, not just one day but every day. From near or far, send this sweet greeting to remind your grandparents that it's their moment to smile.