Does anyone know of any rules regarding playing at both the varsity level and JV level in the same season?
Not sure of the rules, but it's fairly common. Technically, they are both considered "varsity". JV kids get brought up for playoffs every year and sometimes kids that get brought up before the season and don't play get sent back down (either by parent request of coach). The rules really only apply to anyone playing on a "varsity" team (JV or V) and going back down to play MS sports. That's not allowed.