My son doesn't want to go on a residential trip that the whole school year are attending. He is adamant (he's a real home body) and even though his twin brother is going he doesn't want to. He doesn't like adrenaline type activities and hates heights. Generally I try to override his negative approach to anything new but this can backfire as he feels he has no control. Part of me thinks that he's 9 and he is able to make this decision for himself. On the other hand I don't want him to be deprived of the opportunity to overcome his potential homesickness/fear of being away from home. He doesn't care that he will be left out so peer pressure has no affect. Help!