Please click this link to the R1b-BY11722 portion of the DCG Cladogram. A Cladogram IS a family tree with the crucial difference being we can only see branches where there were Y-DNA mutations. All the numbers in the beige boxes are just the naming system used to identify each unique mutation to the Y chromosome. Each beige box represents a new branch.
Your brother's result of being R1b-BY11722+ indicates that he is almost certainly descended from the Uí Briúin Bréifne, Cenél Áeda Find, Muinter Maíl Mórda. However, he does not belong to one of the established branches, so exactly how he fits is unclear until he has some closer matches and we can be begin to see a pattern in the surnames. Also, please bear in mind that not every family was recorded in the genealogies. Their primary purpose was to keep track of families that were eligible to assume the cland chieftainship. As a result, branches that became too distant to the primary chieftain line were not recorded.
Here is an abbreviated table of the Uí Briúin Bréifne, Cenél Áeda Find by Dr. Paul MacCotter. The Muinter Maíl Mórda are on the right side:
