So it looks like it's not just Ellie from The Last of Us with a twin sister. Joel has one too: Big Boss from Metal Gear Solid: Ground Zeroes. Not to mention the artwork looks pretty much the same, too.
Plus "Stealth of Us" is an anagram of The Last of Us.
Joelid Snake - Big Boss lost twin brother [NeoGAF, via TheOmeagaNerd]
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