Take her away!
I could understand this if she went out and bought the booze and set it out for the kids. But doesn’t that raise a conspiracy in that Jr. and the rest of the kids might have been involved in the arranging and invitation to the party? If so, how much time did Jr. get for arranging the party where this happened?
Otherwise, if in fact she was not present, did not buy the booze and Jr. broke into the liquor cabinet then 3-5 years tops.