There is no single solution anymore, you're just getting an absolute no-sense answer + not solved the problem! KYC first before you can play or even deposit is the only solution for this problem, they using ID parent or other people's ID? is simple just need to add one more rule "KYC" while you need to picture yourself with the "ID" to make sure the id belongs to the person. This also to prevent someone using people ID.
If the kids ask to their parents for doing photos by holding an "ID" then they will have some suspicious with their kids. People hate KYC? come one even you can withdraw without "KYC" on every TOS/T&C (If you read off course) there always has some situation casino will ask you doing "KYC".