Yeah that is weird. I can see how it would be very awkward for her. Is there any chance you could actually be related to her and her brother (or just the brother if one or both of them is/are adopted)?
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Balance is needed within the universe, can be demonstrated in most/all concepts/things. Black/White, Good/Evil, etc.
All dependent upon your own perspective in your own form of existence, so trust your own gut and live the way YOU want/need to.