We spent a lot of time theorizing on Mer and Der, Owen and Cristina, and of course George and Izzie, but what's ahead for the Grey sisters on Grey's Anatomy?

You know how when sad dad Thatcher Grey swings by Seattle Grace, he almost always stirs up some sort of trouble or angst, TV Guide accurately notes today.

But amazingly, his April 30 visit will apparently bring Meredith and Lexie closer together. That would be nice. How do you think his visit will accomplish that?

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.