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Family Matters is the tenth episode of the sixth season of ER, and the one hundred twenty-fourth episode overall.
Starring: Anthony Edwards (Dr. Mark Greene), Noah Wyle (Dr. John Carter), Julianna Margulies (Nurse Carol Hathaway) (credit only), Laura Innes (Dr. Kerry Weaver), Alex Kingston (Dr. Elizabeth Corday), Kellie Martin (Dr. Lucy Knight), Paul McCrane (Dr. Robert Romano), Goran Visnjic (Dr. Luka Kovac), Michael Michele (Dr. Cleo Finch), Erik Palladino (Dr. Dave Malucci), Ming-Na (Dr. Jing-Mei Chen)
Guest Starring: Ellen Crawford (Lydia Wright), Yvette Freeman (Haleh Adams), Mike Genovese (Off. Al Grabarsky), Brian Hooks (Dylan), Leo Rossi (Det. Cruson), Andre Fogenay Wilson (Jake), Andrew Bowen (Andrew), Alice Dodd (Mrs. Sumpter), Mae Elvis (Alyssa Adams / Jane Doe), Erica Gimpel (Adele Newman), Thom Gossom, Jr. (Mr. Davis), Juanita Jennings (Mrs. Davis), Cody Kasch (Jason Bender), Mary Manofsky (Cassandra Harper), Victor McCay (Dr. Ramsey), Michael Buchman Silver (Dr. Myers), Amy Stewart (Linsey Cordova), Austin Tichenor (Mr. Sumpter), Gabrielle Union (Tamara Davis), Gedde Watanabe (Yosh Takata)
Co-Starring: Elan Israel Akin (Max), Amanda Bernero (Mary), Brooke Davis (Tracy), Dave Engfer (Everett), Tania Gonzalez (Shannon), Lynn A. Henderson (Olbes), Demetrius Navarro (Morales), Emily Wagner (Pickman), Caryn West (Mrs. Bender), Mary Kay Wulf (Mrs. Cordova)
Dr. Chen returns to County General to continue her career in emergency medicine; she cares for a runaway teenage girl whose parents sent her to a treatment facility because she is gay; Luka tries to make sure that two brothers (one of whom is developmentally disabled) are not separated by social services; Corday is asked to convince murderer Dean Rollins about the whereabouts of another woman he killed; Finch treats a teenage girl who injures herself after falling asleep at the wheel due to her busy schedule of school and basketball; Mark heads off to San Diego after learning that his father left his retirement home.