A Three Years Old

My nephew is three years old and lately I have been spending more weekends with him and bonding with him.
He comes home many times from daycare and is upset that this kid took his truck or that the supervisor got upset with him that he took something that doesn’t belong to him and hurt his feelings.
Whenever that happens my brother (his father) immediately takes out the feel good card and offers ice cream, that apparently in his three years of life on this planet, had already proven to work every single time 🙂

I wonder if there is a way to try to pass on some of the ideas we learn here to this child, and if so, how to do that?
Also, is there a Life Coach School coach who coaches little children?

Many thanks!