"brother and sister" should imply "brother", "sister"

Background Pony #244C
Better idea, why not just nuke bother, and sister? I’m struggling to think of any compelling reasons why they need to exist.
rautamiekka
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@Background Pony #244C
TBH I’ve the same problem, cuz if there’s 1 bro or sis, there has to be a 2nd bro or a sis; you can’t be a bro or a sis if you’re the only one. For ex, a dad and a bro would be father and son if anything.
That, and a step-brother and step-sister ain’t the same as those.
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