'Generation' in the Bible

These are the records of the generations (family history) of Noah. Noah was a righteous man [one who was just and had right standing with God], blameless in his [evil] generation; Noah walked (lived) [in habitual fellowship] with God.

Then the Lord said to Noah, “Come into the ark, you with all your household, for you [alone] I have seen as righteous (doing what is right) before Me in this generation.

Then in the fourth generation your descendants shall return here [to Canaan, the land of promise], for the wickedness and guilt of the Amorites is not yet complete (finished).”

Joseph saw the third generation of Ephraim’s children; also the children of Machir, the son of Manasseh, were born and raised on Joseph’s knees.