When Methuselah was 187 years old, Lamech was born to him.
To Enoch was born Irad, and Irad was the father of Mehujael, and Mehujael the father of Methusael, and Methusael the father of Lamech.
And Enoch walked [in habitual fellowship] with God; and he was not, for God took him [home with Him]. [Heb. 11:5.]
Methuselah lived after the birth of Lamech 782 years and had other sons and daughters.