Genesis 7:1

"The Lord said to Noah, 'Go into the ark, you and your whole family, because I have found you righteous in this generation.'"  Genesis 7:1

Now that Noah has built the ark as God commanded him it is time for him and his family to enter into the vessel.  So far the only role his family has played in the story is that they exist.  I would assume that they helped Noah, but the Bible doesn't actually say one way or another.  His three sons were old enough to have wives, so surely they were old enough to help their father and be accountable for their actions.  Were they also righteous in God's eyes?  Or were they simply reaping the benefit of their father's good behavior?