I'm glad you're proud of being proficient at using contractions. Unfortunately, given the lack of tone in this medium, I can't quite tell if both uses of "who's" were intentionally "questionable" in your post. There's at least a chance that "whose" (possessive form of who) versus "who's" (who is, who has) is still a challenge. In either case, the entire parenthetical comment should be contained in parens. It always cracks me up when someone jumps to correct another poster's grammar in a post that, ironically, includes a usage or spelling mistake. If I've similarly left the door open, please point out my error(s) and I will gladly laugh at myself.