The router should have a list of active and inactive ip addresses and mac addresses which have used it, within the admin login.
Take a look and eliminate his machines (PC, phone, tablet etc) the one / ones that are left are the culprits.
@Soul started
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The router should have a list of active and inactive ip addresses and mac addresses which have used it, within the admin login.
Take a look and eliminate his machines (PC, phone, tablet etc) the one / ones that are left are the culprits.