The niece is 6 years old and the little nephew is 3 years old. My niece is very gentle, even a little timid and doesn't like to talk. My little nephew is very naughty, so I haven't seen him.

Now that you know it's a mess, leave it alone. Children and grandchildren have their own blessings. No matter how educated they are, they will always be their father. Everyone has a different opinion. Your brother-in-law is used to this. You must support her. Otherwise, he thinks your sister is easy to bully. I remember when I was a child, my father slapped me in the face, my uncle hid me, and then told me the truth, so that I would admit my mistake first, and then my father would.