If you have to send a take down notice to someone under the DMCA, send it to them and not their parent:
Under our legislation, the notice must be sent to the carriage service provider’s “designated representative” (Reg. 20D) and the carriage service provider must publish a notice on its website prominently identifying the designated representative, and their contact details, to whom such notices should be sent: Reg. 20C.
Of course, all this begs the question, what on earth (or in cyberspace) is a “carriage service provider”? (Unhelpful) hint via s 10 of the Copyright Act, look at s 87 of the Telecommunications Act 1997.