Now what can happen

It has to change reality by altering the past and it's completely retroactive let's say you wright in.

Marry walked down the street naked geting spanked by her younger brother on her birthday.

This would have To be explained like on their birthday a boy can order a family member to do anything all day and this has been a law since 1900. Or it can be a sister must obey their brother. And if you don't specify it will create a background that you will be unaware of example.

John Doe doesn't have to go to school.

The background could be something like you graduated college when you were 6 or it can be John was never able to get into school and has the knowledge of a 5 year old