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Source: ABC

'Grey's Anatomy' Fans Are Finally Meeting Derek Shepherd's Fourth Sister in Season 15

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Get ready, Grey’s Anatomy fans. You’re about to meet Derek Shepherd’s fourth sister, Kathleen. 

Over 15 seasons, viewers have been introduced to three of the late doc’s siblings, including, of course, Amelia Shepherd (Caterina Scorsone), who became a main character on the series in Season 11. 

According to TVLine, Kathleen will appear on the April 11 episode, "Good Shepherd," which will be "Amelia-centric." Scroll down for more information about the sisters’ highly anticipated reunion. 

What we know about Derek Shepherd’s sister, Kathleen (aka Kate):