grey's anatomy

We're FINALLY Going To Meet Derek & Amelia's Sister Kathleen On 'Grey's Anatomy'

Derek Shepherd (R.I.P., he should have had a head CT) infamously had four sisters. Grey's Anatomy fans have met three of them over the course of 15 seasons — Nancy, Liz, and, of course, Amelia. But now Kathleen Shepherd is coming to Grey's Anatomy,…
By Martha Sorren