[KarenH]

Do you have other adults in authority above the mentor level--such as school principal or school board members--who think that bylaws are going to be necessary for your team? If so, you should probably do what those people request. If not, perhaps it would help to explain to the new mentor how your team works, and to demonstrate that the team's structure and rules are already adequate for running the team.

Caution: If you do adopt bylaws, make very sure that you have a section detailing how to change the bylaws. I know of an organization, legally a nonprofit under state law, that is trying to figure out how to make necessary changes to its bylaws when the bylaws don't allow for being amended.