In a new sibling trend, sisters on TikTok are identifying themselves as either the “pink sister” or the “purple sister” — but what exactly is the “pink vs. purple sister” theory, and where did it come ...

Is this a new sisterly rivalry? A new TikTok trend, #pinksisterpurplesister, has siblings divided over whether they are the “pink sister” or “purple sister,” with each color identifying different ...