We are reading several good books together, Richard Wurmbrand's 'Tortured For Christ' and 'Hearts of Iron, Feet of Clay' by Gary Inrig.
I love the sounds of the boys voices too as they do their own Bible study before bed. I resist the urge to jump in and help so the theology is sometimes a little slanted but I can redirect that later on. We are given such a gift to be able to teach our children, but we need to give them plenty of time to be taught by the Holy Spirit too. I encourage lots of independent Bible reading. It amazes me, sometimes, what God lays on their tender hearts.