im sorry i dont know but why dont you try with comics? or 4- koma mangas they have less dialogue and they are shorter than the regular mangas and i think that its a good start..
I read one manga which is not that long.
http://www.mangago.zone/read-manga/grow_up_with_my_daughter/
It is a little story divided in 4 chapters right now. A father is describing his life with his wife and his daughter. It is really sweet and it may not be too much for the beginning. The speech bubbles are not that long and it is easily understood I think. Hope that helps even if it is short. If you don't find appropriate manga for that matter how about writing your own stories? :3 you can also moderate the amount of speech according to your brother. Fighting!(๑•ㅂ•)و✧
I just realized there are some mistakes in the translation ;n; normally I just ignore it but in this case it would probably be bad. Sorry ;n;
"Gakeun babysitter" comes to mind.
Hi I was wondering if anyone knows any good manga that elementary kids can use to help them learn to read. My brother has ADHD making it hard to pay attention in class during reading time. I would help him by reading my manga and get him to repeat what I said while pointing at the words, but since I moved out after graduation I learned he had to go to summer school again because of reading problems. So if there are any suggestions of kid friendly manga that I could possibly send him would be greatly appreciated.