"And it came to pass that Methuselah, the son of Enoch, was not taken, that the covenants of the Lord might be fulfilled, which he made to Enoch; for he truly covenanted with Enoch that Noah should be of the fruit of his loins."
The City of Enoch, with Enoch and the saints were taken up to heaven, leaving behind his son Methuselah. If my math is right Methuselah and his son Lamech both witnessed the testimony and death of Adam, along with the City of Enoch being taken up. Lamech's son is Noah, and his grandson's are Shem, Ham and Japhath. Noah was born just a few years after Enoch and his city were taken up to heaven. Noah and his sons were also born after Adam's death so they could not witness his testimony face to face. The witness they received was from their grandfathers.
Jewish tradition says Methuselah died 7 days before the great flood. Lamech died 6 years prior. I just sat and pondered on these great men Methuselah, Lamech, Noah, Shem, Ham, and Japhath all being together. Grandfathers, sons, and great-grandsons. They survived the most wickedness of times together. They were together to prepare for the great flood that would cover the earth. I thought on the importance of family and our witness of the truthfulness of the gospel to our children. What an important role grandparents and great-grandparents play. Noah needed the witness of Methuselah to fulfill his mission on this earth. The church may flee, but the basic family unit will remain for the eternities. The basic family unit is where the essence of the gospel should be taught.