As Meredith adjusts to life without Cristina, she finds out she has a maternal half-sister named Maggie Pierce (Kelly McCreary), who is now working in Grey Sloan Memorial as the newly Chief of Cardiothoracic Surgery. Meredith is in denial and rejects Maggie, thinking she would have remembered if her mother was pregnant. Meredith tries to piece together her relationship with her mother and half-sister by going through old videos of her mother. She eventually recovers her repressed memories of the pregnancy when she views her mother's diary. With the support of Richard Webber (Maggie’s biological father), Meredith has a change of heart, choosing to accept Maggie and begin building a relationship.