This week on Grey's Anatomy, upon receiving some unsettling news, Meredith and Derek take preventative steps for their children's future. What is the unsettling news they receive, exactly?

In the sneak peek below, from tomorrow night's "She's Killing Me," Mer asks Bailey to tell it to her straight: Does she have the Alzheimer's gene or not? Are the warning signs present or not?

Sadly, it looks like she does, and they are ...

Meanwhile, a group of Syrian doctors arrive at Grey Sloan Memorial Hospital for a crash course in basic surgical skills that they plan to apply in the field, leading to a variety of complications.

Also, April decides to come clean to Matthew regarding the truth about her virginity, and multiple pre-op patients at GSMH develop infections, causing one doctor to wonder if she is at fault.

Check out this week's Grey's Anatomy promo and share your comments with TV Fanatic below: What do you think Mer and Der will do given the news Bailey unfortunately gives them?

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