If parenting were easy and there were cheat codes, there wouldn't be so many assholes in the world. Since the primary source of assholes is bad parenting.

Convincing someone of something using reason and logic requires that someone to understand how reasoning and logic work. Children have underdeveloped brains, so it's very hard to convince them with reasons and logic every time.

I'm not a parent, so I can't assure you this. But probably each kid needs a different approach, and you probably have to try a lot of different approaches until (hopefully) one of them sticks. That's what I try to do when encountering someone that don't know how to use logic and reason.