My son is 3 years and 9 months old. I have a problem telling my 5-year-old niece that she is bothering my son. She's always telling him that she has something that he doesn't have, or knows swimming and he does not, or that she knows better than him (on a specific case) knowing that she is older than him. He becomes angry everytime she bothers him.
I'm confused and at the same time angry about this situation. I always tell them that it's ok for not being the bigger or the taller. And that dad is taller than me and I'm taller than you and it's ok. I haven't talked seriouy with her parents yet. My son starts the competition in everything with everybody, especially his little brother. I know better than you, I'm the strongest etc.
How to make my niece stop bothering my son?