Yeah, his sister in the FMV--most likely his real sister--was named Evelyn or something to that effect, not quite sure how you'd spell it. In game his 'sister' is named Verena, though I highly doubt they're blood relatives.

That site is magnificent, but like Miriel said, there's a ridiculous amount of spoilers on it. That didn't stop me from reading it, though. It can take a long time to figure out all this stuff (as a lot of it is revealed in RoZ) and at some point you just want things to make some sense.

I also believe Chains of Promathia added Tavnazia as an accessable area.