If you heard "Batman has four sons", you'd be forgiven for thinking that each of those sons has three brothers. But that's a rookie mistake. Dick is the only one of them who actually has three brothers, and that's because he put in the work for it, thank you very much. Jason has one brother (Dick), and two kids that his dad had after he moved out (Tim and Damian). Damian actually ping pongs between acknowledging Tim and Jason as his brothers, and thinking they don't count because they're not related to him, but regardless of how he feels about those two he is always related to Dick, Dick just isn't always his brother. So Damian can vary wildly from having three brothers to two brothers to zero brothers.
Tim is literally only brothers to Dick. The other two are his annoying coworkers.
