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As a parent to the child, can you allow the child to use your details to pass KYC verification, if asked? And if you do that, does it also mean that you are supporting underage gambling?
For me, this situation looks purely hypothetical, since I would not allow a minor to play, since it is prohibited. In general, I do not welcome any violations of casino rules. If I don't like some rules, I'd rather ignore such a casino than look for loopholes to circumvent the rules. Moreover, there are a lot of alternatives in the gambling industry, including even without KYC (where the described situation with a minor would not have arisen at all).