Overview
The Bible does not teach a specific doctrine about grandfathers returning. However, Scripture emphasizes honoring our parents and elders, and affirms that believers who have died will be resurrected when Christ returns. Our hope is in Christ's return, not in the return of deceased family members.
Key Scriptures
"Honor your father and mother, that your days may be long in the land that the Lord your God is giving you" (Exodus 20:12, ESV).
"For the Lord himself will descend from heaven with a cry of command, with the voice of an archangel, and with the sound of the trumpet of God. And the dead in Christ will rise first" (1 Thessalonians 4:16, ESV).
"Jesus said to her, 'I am the resurrection and the life. The one who believes in me will live, even though they die'" (John 11:25, NIV).
Application
Cherish memories of godly grandparents and live by their faithful example, while placing your ultimate hope in Christ's return and the resurrection of believers.