Camping with a 13 year old boy?

I plan on taking a 13 year old boy hunting with me for the 1st time this year. His grandmother doesn't trust me to take him by myself since I am an openly gay man and very flamboyant about it. I wear turtleneck sweaters, long hair in a pony tail, I drive a hybrid, I carry a man purse, I speak with a lisp and I often pirouette for no apparent reason. I am tested for HIV every 30 days for my own peace of mind, and so I can tell my many partners how clean I am. Anyhoo, this grandmother seems to think that just because I am gay I am into little boys! All I want to do is teach this por city boy how to hunt, and when he's 18 maybe then we can take our friendship to the next level, who knows. What I really want to do is get this 13 year old boy used to camping, used to sleeping in a tent with a man, and make sure he's completely comfortable the whole time, I don't want to risk scaring him and having him lose interest in me and hunting. The grandmother is really cramping my style though! She knows there isn't enough room for her in the tent, I suggested she buy her own tent to sleep in so the 13 year old and I can have this one to ourselves. She wants to buy me a 4 man tent so we all can sleep in it together! How can I convince her to trust me and trust my intentions with her grandson? I can wait 5 years for him to be legal!