Looking for a passage on the effect of good/bad actions on your family through time

I don't remember the exact context surrounding the story/situation, but the message was about the impact of one's good or bad deeds through time. I remember it said something like: good things go down on your family for three(?) generations, while bad things will affect you for twenty(?) generations. If you recall a similar passage, let me know, it may be the one I'm looking for.