Was on a flight and the woman in the row in front of us had a screaming (about) 4 year old. She would hold him over her shoulder so he was screaming right in our face. The guy in the seat next to them had the most fun when the kid turned his head and vomited all over him.
I was on a flight recently where a woman let her 2 year old do whatever she wanted because if she tried to belt the girl in for take off and landing, the girl screamed bloody murder.
So the mother let her crawl around the seat during landing and the flight attendants turned a blind eye.
I could see who is in charge in that family.