ok so the words i wanted to dissect today are the words 'sister' and brother'
ok. so when u call another male person who isn't really your brother, a 'brother' in means you are tight with him and close in relationship with him
but you cannot call a female person your sister, unless she really is your sister.
and you ask why, good sirs?
because, as a matter of fact, for brothers, whether they are your real brothers or a brother from another mother, or just not a brother at all, you can still chill with them, and in fact, you are closer to your brothers than other random strangers.
for example, you would not call me a 'bro' becuz you guys don't know me in real life, unless u think i have a cool story, then u can say 'cool story bro'

ok, now alternating to the opposite sex gender, the female, u cannot call her a 'sister'.
and you ask why, good sirs?
because i'm sure that if a girl is hot, u wanna fuck her, and i do'nt think anyone wants to fuck their sisters because that is ethically wrong and is termed 'incest', which is just gross
so would u call a girl that u were interested in a 'sister'?
i think not...
i wouldn't for sure, cuz it just feels weird and awkward and the girls feel the same cuz they don't wanna be fucked by their brothers.
so, that being said, it's ok to call other guys 'brothers' but it is a hidden rule that u must not call other girls 'sisters' becuz that is just a turn off.
this is it for today, have a nice day folks!
happy new years!