Shouting at parents - not scared of authority
You don't want them scared, you want them to respect authority and not want to upset their parents. If you have a good bond with a child they ultimately won't want you sad or hurt.
Horrible to other children - bullying behaviour
Place them away from the child they are harming, in their room.
Needs physically manhandling to go to preschool on occasion or other places they don’t want to go
Are they being given enough time to get ready without being rushed and stressed out ? What is the punishment for this ?
Utterly defiant - continues with bad behaviour when asked repeatedly to stop
Why are they being repeatedly asked, surely it's twice and then the consequence is enforced ? Are they doing this.
Plays parents off against each other
Parents need to change, this shouldn't be possible
Spoilt
Parents need to change how they give their child things or treat their child. What are these children getting rewarded for,
Stubborn
That's not necessarily something that needs to be stopped, but worked with and managed by their parents.
Strong willed
This is not a bad thing if used correctly. I think strong willed is a good thing, don't break their spirit, teach them how to use it positively