It's a matter of patterns. The first two truths were sweeping generalizations, and difficult to believe, especially if you're from a place where snow is common! But you specified you had three sisters. It's much easier to tell a lie when it's close to the truth, and it's tempting in a game like this to think you'll win if you claim something technically true, but unbelievable.
In fact, I'd wager you have at least one sibling, and it's only the number -- or the gender -- that's the lie.
<heysherry>
In fact, I'd wager you have at least one sibling, and it's only the number -- or the gender -- that's the lie.