<P> David Maurice Healy is played by Johnny Galecki . David Maurice Healy is Mark's younger brother . He first appeared in "The Bowling Show" (episode 4.14) when his first name was indicated to be Kevin . In a season 6 episode Roseanne comments that David isn't his real name, it's just something that Darlene made up . So it's possible that Kevin really is his name, although everyone including his own family call him David, and Roseanne might not have been serious . Whereas Mark acted like a rebellious delinquent at first, David is friendlier to the Conners . He's shy, polite, thoughtful, sensitive, soft - spoken, artistic, and intelligent . He has a relationship with Darlene and collaborates with her by illustrating graphic novels that she writes, being the submissive one in the relationship . His manner is endearing to the Conners, who think of him as part of the family and jokingly refer to him as being more welcome than Darlene . He moves in with the Conners after Roseanne, herself a victim of child abuse, sees how abusive David's mother is to him . David and Darlene break up three times throughout the course of the show, each for a longer period of time than the last; they always end up back together . Eventually, David impregnates Darlene and they decide to marry . In the series finale, Roseanne reveals that David had actually been dating Becky in "real life," and that Roseanne simply wrote his relationship as being with Darlene because she felt it made more sense . That series finale is retconned for season 10, where it is revealed that David and Darlene have separated and David has been away traveling and doing volunteer work, leaving Darlene to care alone for their two children, Harris and Mark . He later visits Darlene, telling her he is moving back into town to settle down with another woman and asks her for a divorce . After they end up sleeping together, they both consider getting back together until Roseanne informs Darlene that it wouldn't be good for their kids, who resent David for not being there for them . They both agree to move forward with the divorce and on Dan's urging, David agrees to get his act together and proceed with the move before he can see the kids again . </P> <P> When David was first introduced to the series, it was said his name was Kevin, not David, but while applying for college, he uses the name David Maurice Healy . Writers might have tried to explain this discrepancy with a comment Roseanne makes in Season 6, saying "David's not even his real name . Darlene made it up!" However, in real life, Barr reportedly wanted to name the character David from the beginning but the idea was shot down as Galecki was starring on another show, Billy as a character named David . </P> <P> Harris Conner - Healy is portrayed by Emma Kenney . The elder of Darlene's two children, Harris is a teenager who possesses her mother and grandmother's sarcasm and bears a strong physical resemblance to Darlene . Having grown up in Chicago, Harris is less than thrilled about moving to Lanford and is resentful towards her mother and hostile towards her family members . As Harris continuously shows herself to be indifferent to the needs of others in the home, Roseanne does what Darlene hasn't done; she confronts Harris about her rude and discourteous behavior . Though Darlene is initially upset by the confrontation between her daughter and her mother, she accepts Roseanne's actions as justified when she discovers that Harris, left to make her own decisions, has been selling stolen goods on Etsy in an effort to raise money to move back to Chicago . While Darlene is sympathetic to Harris's unhappiness, she exerts more control over her daughter's life, grounding her and demanding passwords to all of her social media accounts . </P> <P> Mark Conner - Healy is portrayed by Ames McNamara . The younger of Darlene's two children, Mark is a 10 - year - old boy with a strong interest in fashion . His interest in things traditionally feminine, such as wearing makeup and skirts, is somewhat worrisome to his grandparents, with Roseanne worried that Mark will be bullied by his narrow - minded peers and Dan feeling that he needs to persuade the youngster to take on more masculine traits . Noticing a classmate make a snide comment to Mark on his first day at school in Lanford, Roseanne threatens his classmates by telling them she's a witch, while Dan gives Mark a pocket knife, which ultimately results in him being called to the principal's office and sent home from school for the day, much to Darlene's chagrin . Despite Roseanne and Dan's concerns, they express support and love for him . Mark is named for his deceased uncle, Mark Healy . </P>

Who played the daughter of darlene on roseanne