Thank everyone for their responses.
To reply to your questions:
a. Homesickness: This is not a problem. He wants to get away from his family, and do something besides be quiet while his parents nap and pass gas. His only concern is leaving is dog and the family cat (he is afraid his sister will do something while he is gone).
Remind him that if the sister is going to do something to the cat and dog, she doesn't need to have him go off to camp. She can do that at any time.
b. Does he want to go: Yes, in fact I a afraid it may be hard for him to comeback.
That's kinda like all of us here on the forum.
c. Merit Badges (MB): Initially, he wanted to go for a number of MBs, but I talked to him and we agreed that to start he should take the first year program and swimming. He already knows how to swim , so I thought it would be a good one for him.
He wants to avoid badges like basket weaving, because his father will mock him endlessly. I cannot understand how a man can enjoy publicly humiliating his own son so much.
A nice balance between "school" and "outdoors" would be any of the nature MB's. Mammals, Reptiles, etc Heck, just have him go fishing and do the Fishing MB.
My concerns were as follows:
1. Advancement: I want to keep him from getting obsessed about advancing. I just want him to have some good memories. Also, I do not want him to get burned out and quit. The advancement process with patrol method and leadership requirements would tear him apart. He needs to just be a happy First Class Scout who does a lot of hiking and camping.
From what I can tell, advancement shouldn't be a problem. He has the were with all to do that and might even enjoy working more with this hands rather than just the heady knowledge kinds of things. The leadership shouldn't be a problem either, he can work into that slowly and if he gets into real servant leadership, it will open a lot of new doors for him relative to relationships with others. The "in charge" style of leadership/management isn't the only style available to him. I have seen a lot of the "quieter" boys do very well with servant leadership, much to THEIR surprise.
2. Introvert: My nephew is an extreme introvert. Introvert does not mean shy as most people think. Introvert is someone who recharges their energy by being alone. Conversely, they lose energy by being around people. I am afraid that being around people constantly will turn him into a zombie.
Being Buddied up with someone quiet will be a good thing for him. Let the SM know this and work it out that the boy who likes to sit and listen would make your nephew a good Buddy. An agressive, active boy drains the energy out of a regular person. He just needs someone to quietly "be with" until they kinda grow on each other. It'll work just fine with a nice match. An older, more mature, Buddy who understands this would be a good fit too. He can keep an eye on him from a long arm's length when needed. As he goes to the different activities he'll need different temporary Buddies. Simply being exposed to a number of different boys will be good for him.
3. Temper: My nephew has a temper, and I do not blame him. Most of the time he keeps it under control, but if he gets really tired he could lose it. A couple of weeks ago an old man who lives in his neighborhood threw a rock at his dog, because he thought it would "funny" to hear him yelp. My nephew was on him like a wolverine with rabies. He backed him into a corner and cussed them out royally.
Let the SM know about this. If he is aware up-front, he can help the boy stay clear of volatile situations. Heck, I'd tear after someone throwing rocks at ANY dog. It may not be a temper issue in so much as it's a caring issue. He's worried about his dog/cat and is sensitive to the welfare of the animals. This is a good trait to have. The caring attitude goes a long way if he can focus that onto other people along with the animals.
If something like that happens at camp he will get thrown out, and his parents will use it as an excuse to never let him out of his room again.
Again, let the SM know about this and if he/she has an understanding of how it works, they won't be taken off-guard if push comes to shove.
If he goes to camp he will not make any friends, he does not have it in him. Instead he probably make some enemies. He has to learn to be around people, but I am afraid camp might be "jumping in the deep end" for him. Alone he can do anything he sets his mind to, in a group situation he falls apart. I think the reason he initially got interested in camping was the idea of being alone outside where he was free.
Never underestimate the possibility that others will make friends with him! If those in his patrol know he's "different" they will have the opportunity to reach out to him and not wait for him to reach out. Maybe explain to your nephew that scouting is not just for him, for his advancement, for his enjoyment, but that he's a part of something. This dynamic is not something he gets at home. He doesn't get a positive sense of belonging to family, but maybe if he is aware of it, maybe scouting can become the family he's missing. Maybe a heads up for him to be looking for that at camp, too.