Can i sue for these reasons help asap?

Ok well im 20 and when i was 15-18 i lived in washington and was sold alcohol at 7-11 can the owner be sued for letting this happen? He has been busted for selling to underage people before the guys that use to work there that he fired cause all of them use to sell to me have agreed to be on my side with the whole thing and agree that alcohol was sold to me from that store i even have freinds and family that have seen me walk in and buy alcohol there along with my fathers ex fiance that wasnt to happy about it. Do you think i have a chance at sueing him?