As horrible as it is to contemplate as even a remote possibility-- given what you said about your sister-- I'd have to share your doubts that it is anything other than your sister's created delusion. What possible good could come from relating such a story to you or anyone else--especially given you would never have remembered it as an infant? You say your sister is abusive and has many issues of her own. I'd be hard-pressed not to think this story that can only cause pain is likely part of that situation--that instability-- with her. I wish she'd not told you that. I hope you can put it aside and not let it cause lingering harm from something you can (and could) never know. Now that you are an adult, I tend to think the friends/family who discount this story would have little motivation to tell you anything but the truth.
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