I have also heard that children are honest and they tell what they think. This is true with most of the kids. But, still some children lie and each child lies for some reason.
My neighbor’s daughter used to lie about various things to my daughter. Though my daughter knew that those were lies she never argued with her. I used to wonder if it was her habit to lie or if her parents knew about it. A few months later I learned that the girl wanted attention, so she lied!
Some children also lie to parents about the play time and home work.