Sis and Bro...uh what?

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so, I'm the youngest of 3 sisters (i'm also trans) and I have an identical twin brother. I have also known others with siblings, and since coming to this site (and admittedly, others) I have encountered a curious phenomenon where people refer to their siblings by 'sis', 'sissy' or in male cases 'bro' or 'lil bro' or stuff like this.

I have to admit, it utterly baffles me, because i have NEVER seen this in real life; we always used each other's names and not titles, only using the titles when introducing each other. IE: This is my brother, this is my sister, et cetera but never in casual conversation in lieu of their actual name. It seems very silly and contrived and my knee jerk thought is that it's done by people who haven't had siblings. But this can't be the case, can it?

Am I alone here? Is this a common thing and I'm just the odd one out? Because it seems very strange and odd to me.

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