So when I told RobertPlant that, as it turns out, I have a sister, he told me that he was convening a meeting of the Only Children's Club and, as president and treasurer, would move and second a motion* that my membership be terminated with extreme prejudice.
However, the news has given Tam O'Shanter hope. She thinks that like my half-sister, she'll wake one magical, golden morning to learn that she is also adopted.
*A messy business. Glad I won't be present for it.