If you don't understand here is what happened:
Mrs. Afton whistled that tune to C.C when he was younger and Michael is jealous because she focused her attention on his little brother even when he himself was suffering.
Even though it might not be fair that he put the blame on C.C., to a young teenager I felt that these emotions would fit.
"Oh mom and dad aren't paying attention to me. Why are they not paying attention to me? Because my younger siblings are taking them away."
![](https://s2.save4k.ru/pic/kwj426cgVcE/mqdefault.jpg)