It's a blessing when your kids and your parents get to spend time together. It's a grandparents job to spoil them endlessly! You know the saying, "what happens at Grandma's house stays at Grandma's house!". 

Your parents impact families for generations. Most of the traditions your family celebrates today were probably passed down from them. Your kids will remember the holiday decorations your mom had each year and that the good china dishes came out at Easter. 

They pass on fading hobbies like knitting, crocheting, or quilting. Watching your kids spend time with your mom learn those skills is precious. Home made anything in the kitchen these days takes a back seat to the rush of life with young kids. Grandkids will learn the recipes that call for "just a pinch" of this and a "dollop of that" -- those old recipes written on yellowing index cards in Grandma's handwriting... and they'll remember that she would sneak them one more cookie even after mom said no. 

Grandparents often live a slower life.  They've already "been there, done that" with carpools and being PTO moms.  They usually add the slower pace and appreciation of a good game of cards and reading an actual book! Kids learn to appreciate the music of an older generation, Grampa's love of collecting stamp or coins, building model trains, and telling the best corny jokes? Family history and all of its stories are shared. Grandparents are the history books. There is a special bond shared between these generations.