The 2018 Rulebook reads the exact same as what JMOFF posted.
As for MIKEDB’s question, as the dad of a pitcher, it kills me to say that the starter doesn’t get the win, but even in a shortened game, one inning of work doesn’t pass muster. From there it is very subjective. The win goes to “the relief pitcher who has been the most effective.” Just looking at the info you provided (not knowing if the 5 runs credited to the first reliever are earned, etc), it would appear that reliever two allowed no runs in his 2 innings of work and should get the win. This is applying High School rules to a middle school game, but the W/L/S rules should be similar.