When children become the reason of family disputes.Children are the pride of parents, and parents want their pride to remain, that's why they give such lessons to their children so that no outsider says any wrong thing about them. In the outsider, the parents sometimes involve other family members as well and also feel bad for the children if other members complained about them, sometimes serious disputes happen because of the children. Even if the child is wrong, many times parents take the side of the child because they want to prove their upbringing right in front of everyone.
There is a simple thing which we probably do not want to understand, that the child has also come into this world with a different life, but maybe the parents consider him as their part, so they do not hear anything bad about him/her.
After all, why don't parents (Not every parent but mostly)hear a little negative talk about their children from someone else?