Hair-dresser in need of advice!

There is a woman and her two sons who have been coming to me for years. I like her and she is a good customer. The problem is that every summer she has me give her boy's "buzz cuts." I don't like giving the haircut because it certainly doesn't do much to show my ability but also because I know the boy's (11, 12) don't like getting the haircut. I don't like giving a haircut to someone that doesn't want it. Has anyone else experienced this sort of thing? How did you handle it? Any suggestions?