That's because you also talk about your mind in the third person and not aware of it. You are consistently talking to yourself in your mind throughout the entir

That's because you also talk about your mind in the third person and not aware of it. You are consistently talking to yourself in your mind throughout the entire day. (Try to stop it if you don't believe this is true and exactly this is what you are trying to stop with mindfulness) Your child clearly understands the situation better. I recommend you take up mindfulness meditation as well.