Parents plz help: Caught my 9 y/o sister watching porn and idk what to do

Such as stripping, hot hirl showing big boobs, best tits ever, how to kiss a womans breast, and videos with tits and ass. Wtf do I do? should I tell parent? all on youtube btw. All help is apprectiatsd via /r/Parenting http://ift.tt/2w1ZINz