First,Proverbs 22:6 tells us to “train up a child in the way he should go: and when he is old, he will not turn from it.” For all children, the way they should go is toward God. Teaching children in God’s Word is crucial for all children, who must understand who God is and how to best serve Him. With the strong-willed child, understanding what motivates him—the desire for control—will go a long way to helping him find his “way.” The rebellious child is one who must understand that he is not in charge of the world—God is—and that he simply must do things God’s way. This requires parents to be absolutely convinced of this truth and to live accordingly. A parent who is himself in rebellion against God may not be able to convince his child to be submissive.

The Bible also says for children to obey their parents and respect their parents.  I believe this is true while they are living in  their parent's home.  After that, I believe they will have to deal with God in regards to any rebellious attitude in their life.  Children are never to control their own parents or grandparents.