Strong Medicine

My Sister, My Doctor, Myself (6x18)

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After six years apart, Kayla resumes a relationship with her estranged twin sister Keisha (Tia Mowry), but their reunion is bittersweet due to Keisha's sudden erratic behavior. Meanwhile, medical advances help Lu's patient overcome infertility; Lana helps a well-heeled woman (Beth Littleford) who's concerned about her 5-year-old daughter's bed-wetting; and Peter makes an interesting discovery while minding a neighbor's dog. David: David Denman. Nina: Jenica Bergere. Victoria: Nadine Ellis.