Grandparents are there to ...

Grandparents are there to help the child get into mischief they haven't thought of yet.
 Gene Perret

Quotes from the same author

On the seventh day God rested. His grandchildren must have been out of town.
 Gene Perret
My grandchild has taught me what true love means. It means watching Scooby-Doo cartoons while the basketball game is on another channel.
 Gene Perret
An hour with your grandchildren can make you feel young again. Anything longer than that, and you start to age quickly.
 Gene Perret
Grandchildren don't stay young forever, which is good because Pop-pops have only so many horsey rides in them.
 Gene Perret
My grandkids believe I'm the oldest thing in the world. And after two or three hours with them, I believe it, too.
 Gene Perret