Waterproof?

I'm giving Nicholas a taste of camping tonight by sharing a tent with him in the orchard at the farm where my parents are staying this summer. But I'm getting a pretty good mouthful too. It's about midnight and it's POURING rain. As a former Boy Scout, I knew how to pitch this tent to stay dry. But I can't help but wonder if the waterproofing will hold up under this torrent when tiny droplets of water are hitting my skin.
At least Nicholas is sound asleep. Wish I was too...
The rain smells good though. And the thunderclaps are immense.