Looking after a 14-yo boy, arrived and he's been drinking alcohol

Not sure where to post this (any recommendations would be appreciated).Arrived at 9am for a babysitting/nannying job - today would involve taking the 14yo and his 2 younger siblings to a tennis camp. He was acting strangely, pretty much hyperactive, and claimed to have drunk some alcohol (vodka, specifically, and estimates around 1/3 of a lucozade sport bottle). Got him to do a breathalyser test and it did come back over the limit...I obviously stopped him going to tennis, let his siblings go though, and need to tell his parents.Any advice as to how to do this? I'm inexperienced in all of this - doing this as a uni summer job, and a bit nervous to be honest - torn because I really don't want the kid to hate me and make my life(/job) hell. I also assume there's some legal obligation to telling his parents anyway (I'm in the UK, if that helps). via /r/Parenting https://ift.tt/2MBiKpY