After Methuselah was 187 years old, he had a son named Lamech.
Enoch had a son named Irad. Irad had a son named Mehujael. Mehujael had a son named Methushael. And Methushael had a son named Lamech.
One day Enoch was walking with God, and he disappeared. God took him.
After Lamech was born, Methuselah lived 782 years and had other sons and daughters.