They might not be happy with the idea of getting in trouble, but you are only scolding them because you love them, and later on they will see that, too. Grandparents are the easiest people to love and adore because they can do no wrong in a caring child's mind. They are your parent's parents. They have been around for a long time and they deserve extra respect. That idea is a typical response to a great grandparent, and you can have that status if you do not do anything to prove your status otherwise.
Grandparents can be the most important people in a child's life.
Grandparents can be the people children run to if the relationship between them and their parents is rocky. Grandparents can be the shining light in a storm, the storm being life in general. If you follow the rules mentioned above, you could be that shining light, also. Being a grandparent can be the most important job in a person's life. You can make such a difference in a young person's life.