Last time we saw that Moses speaks of "your fathers" as Abraham, Isaac, and Jacob. Here – in verse 10 – you see this explicitly. Do you see how the rebellion at Massah is not attributed to "your fathers" – but to "you" – even though all those who rebelled at Massah are dead. But it was you who rebelled at Massah – because you are Israel. The LORD swore to your fathers that he would give you the land. So "your fathers" are the patriarchs – but "you" are Israel. And in every generation "you" refers to those who are presently alive – and "you" must teach your children so that they remember what "you" have seen. This is the root of the principle that God has no grandchildren! In every generation you are the children of God. And yes, you must teach your children the ways of the LORD – but that means that you must teach your children that they are the first generation!