No human is actually accessing your family site, don't worry. You're just the victim of log spam:
http://www.google.com/support/forum/...4b3688a8&hl=en
It's unfortunately an annoying hijack. Someone is probably running through all possible numbers of Google Analytics IDs and loading up the tracker for each one with a referral of their domain in hope that you will be curious as to what it is and visit. I got this on my personal site, but I logged into a separate account for work and got similar hits a few days before. I wouldn't bother locking this page down, since it's likely nobody actually visited it, just randomly loaded up your tracker on their page to spam you.