Overzealous parent HELP!!!

[golden_warrior5]

Hello, I am a team captian for a third year FTC team(7491 The Robot Corps).
We are having trouble with a parent who thinks he is part of the team. We held our third meeting for the year yesterday and the parent of a first year kid is trying to change the system without knowing how it works, wanting to add his own ideas to our list of team goals, and trying to lead our game strategy discussion. What is a good way to get this parent to back off without offending him? We have really never encountered this problem before, it is kind of an uncharted water for us. Any advice/past experience would be very much appreciated, thank you.