I want my brother?s help

I asked my brother if he will be able to teach me how to play guitar. He is not such a good singer but I was thinking that if he teaches me some things perhaps after that it could be easier for me to attend some guitar classes. My brother has a very busy schedule and this is why I worry, he might not find the time to teach me. I will help him with a couple of other things that he needs and maybe in this way I will convince him.