No, I really didn’t mean to imply that John has REPLACED Mycroft as Sherlock’s brother!
After all, brothers can also be more than two, can’t they?
And, as you probably know, I’m firmly persuaded that Sherlock and Mycroft, with all their conflicts, are still deeply bonded to each other, and they both know this (after all, the only photograph Sherlock keeps in his room - in the whole flat - is a picture of him and Mycroft as chilren…).
No, what I meant is that John, according to me, has become a sort of “middle brother” - older than Sherlock, but younger than Mycroft - and, as such, and as quite often happens in families, a sort of stabilising and smoothing element in the complicate relationship between the youngest and the eldest Holmes Brothers.
At least, until tRF, where all is called into question again… We will see how this family-building process will be resumed and (I hope) mended in Series 3.