A five year old is far from having been raised. As a parent of a 6 year old I know a bunch of other parents that have similar experiences where their kids are revolting against being forced to sit in front of a virtual teacher for hours every day.
Some study I found that also mentions the seven-year milestone: https://news.softpedia.com/news/Our-Personality-Is-Fully-Dev...
Do people really think that anyone who fights with a sibling past the age of 7 is destined for prison? I guess I need to start making a plan for when I'm arrested.
The grandmother's where you're from might benefit from learning about pervasive developmental disorders and the effects of trauma.
Some people are dealing with stuff that isn't their fault and that they never got adequate support for.