.

IKR~
I also don't understand. For me, as long as they are not blood related and didn't marry to someone else, I'm all good.
Or maybe, Asian thinks differently I guess

thing is they werent really raised together. her "brother" lived most his life at school

Hypothetically, I will think the future is not set in stone. Because we are not related by blood, the possibility is there ╮(￣▽￣)╭
Nevertheless, even if we are raised as siblings, we have limits of interactions there. We might respect them as siblings, but there will be limit set for our interactions.
Although, things are different if we are foster siblings tho.....