Some middle-aged guy on the Internet. Seen a lot of it, occasionally regurgitating it, trying to be amusing and informative.
Lurked Digg until v4. Commented on Reddit (same username) until it went full Musk.
Was on kbin.social (dying/dead) and kbin.run (mysteriously vanished). Now here on fedia.io.
Really hoping he hasn't brought the jinx with him.
Other Adjectives: Neurodivergent; Nerd; Broken; British; Ally; Leftish
"who's" is "who is"[1] or "who has"[2], and it can be wrestled into a possessive if you make "who" all or part of a name[3], but it's the wrong sort of possessive for this context. If you really want the possessive form, it ought to be phrased "which person's", which is mostly what "whose" means.
(An actual linguist would speak more about the genitive and how it works in English, but I'm not as capable.)
[1]: e.g. "Who's there?" [2]: e.g. "Who's let the cat out again?" [3]: e.g. "This is you-know-who's box of tricks."