Thank you!! <3 I think that's entirely plausible, I wouldn't put it past him- BUT I think that he bases his identity a lot around being the oldest brother- that's the kind of power he enjoys (he seems to resent the responsibility of having to take care of them- which is what daddy would imply, but maybe that would make it even better for him depending on your interpretation (making Branch/brothers admit he's their caretaker)) . I think it would get him off more to beg someone to call him "Big Bro". But I also think any honorific would do- I could see him stopping what he was doing if Branch called him by his name, asking him to use the right term for him (I'm your older brother. You call me big bro- got it?)