As the copyright holder, the CC-BY licensing explicitly states "You must attribute the work in the manner specified by the author or licensor". There's no argu

As the copyright holder, the CC-BY licensing explicitly states "You must attribute the work in the manner specified by the author or licensor". There's no argument. You decide if it's an appropriate attribution or not. If it's not, they're in violation of your copyright, period. I agree with the parent that someone who is going to steal your content, is going to do it regardless of the license. And, remember: if you don't actually register your works with the Copyright Office, you can't sue for damages. All you can do is get them to take it down.