Since nine years old is still very young age, I need to be patient and try not to give him too much burden or stress. If not, he might hate English for the rest of his life. So I think in his age the most important thing in teaching English is making him interested in the English itself.
Before starting the teaching process, I would make him realize why he needs to know English. No matter how old he is I still think having a purpose for doing something is very important because having a purpose can motivate him. I can help him find his own reason why he needs to study English by talking about his future dream which might requires English skills. Moreover I would show him the benefit from learning English including making foreign friends, traveling abroad, or the possibility of his friends liking him more.


While studying with his friends, he might realize his deficiency of English skills or want to improve more to be better than his friends. I will help him make his own schedule of studying phonics and vocabularies. Or if he doesn't want to study more, then I will tempt him with the rewards including any sweets, or additional computer time to make him study more.
By this process, I believe my brother will improve his reading skill. At the same time, since he is studying together with his friends, he might try not to be outstripped which might bring the synergy effect in the group. I wish this can help my brother to improve his English skills which will solve my mother’s worries at the same time.