it's a small small world

I'm rarely recognized as myself, I am usually only recognized in relation to somebody I know. Usually it's something like, "Oh, you're a friend of so-and-so" or "Right, you work with that person." But back here I am recognized in relation to...well...my relations, and it's happened twice in the last twenty-four hours. The first time I was walking my pooch at the park and there was this minor traffic jam caused by butt sniffing and genital licking (I'll just let you assume I'm talking about the dogs). Then this woman starts calling out, "S----" and I ignore it. "S----? Hey, you're S---- right?" So it dawns on me that she's talking to me and I say, "No, but I have a sister named S----." "Oh, you're H---'s other daughter." Yep, I'm either my mother's other daughter or my sister's mysterious older sister who just moved from "Alabama, oh Kentucky, same thing"...not an actual person with my own name. Today I opened a bank account and the girl looks at my name and asks me if I have any relatives that also bank there. I tell her that I didn't think so, but then she asks me, "Are you sure you're not N-----'s sister?" "Ahhhh, I am indeed his sister, I didn't realize he banked here."Hmmm, I guess I only have an identity when it is attached to somebody else. So does that make me an identity parasite?