Methuselah: Noah's Grandfather in Genesis 5
Methuselah was Noah's grandfather, and Genesis 5 names that line plainly: Enoch fathered Methuselah, Methuselah fathered Lamech, and Lamech fathered and named Noah. The passage claims no more than that about their relationship.
Who Was Enoch's Son? Methuselah in Genesis 5
Genesis names Methuselah as Enoch's son, then adds that Enoch had more sons and daughters. What sets Enoch apart is the verdict on his life and the way it ended.