Christmas is almost here, and spending time with family can be the best — and worst — part of the holidays. Cramped quarters, conflicting personalities, and childhood baggage means tensions can run high, especially when you don't have any time to yourself. But with a little creativity, you can find ways to squeeze in alone time, and avoid a meltdown. Here are a few: Offer to be the errand-runner: If you're craving a little time…