One of the important, essential "roles" of grandparents is for them to be the "tellers" of the family history. This means we need to be the ones who pass on this history . . . the time when great-uncle Joe did something amazing or the time when great-great-great-great-great grandma journeyed to America. These family "stories" . . . these historical accounts, help give our grandchildren a "sense" of who they are and where they came from.
It is also essential, even more so, for us to be the ones who pass on the true historic accounts of how God has worked in our lives and the lives of our ancestors. Psalms 78 shows us clearly what happens when the next generation forgets Who God is and what He has done. We want our grandchildren to remember, so they will know, love and walk with God throughout their lives.