When Methuselah was 187 years old, he became the father of Lamech.
To Enoch was born Irad. Irad was the father of Mehujael. Mehujael was the father of Methushael. And Methushael was the father of Lamech.
Enoch walked with God; then he was gone because God took him.
After he became the father of Lamech, Methuselah lived 782 years and had other sons and daughters.