Besides the other great advice here, I always try to make my kids question their reality and develop some critical thinking. I will sometimes say things that do

Besides the other great advice here, I always try to make my kids question their reality and develop some critical thinking. I will sometimes say things that don't sense, give answers that are obviously wrong, etc., in order to check if they are really thinking about what I'm saying. My oldest got pretty good at catching these things, so now I'm going to more subtle things, and he is also started catching things that don't come from me: he recently found a plot hole in one of his books. Also, video games are really good at making them interested in numbers, calculations, etc.