[Abdulfattah "John"] Jandali, then a political science student from Homs, Syria, and Joanne Carole Schieble, an American graduate student, were unmarried when Jobs was born in 1955. The baby was adopted by Paul and Clara Jobs of Mountain View, Calif., who named him Steven Paul.
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When Job's illness -- a rare form of pancreatic disorder -- was made public, Jandali mailed him his medical history in hopes it would help his treatment.
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Jandali and Schieble were married 10 months after giving Jobs up for adoption and they gave birth to and raised Jobs' biological sister, novelist Mona Simpson.
Though Jobs refused to meet his father, he shared a relationship with Simpson. She first met Jobs when they were adults, after she invited him to a party promoting her novel "Anywhere But Here," where she revealed that they were siblings; Jobs was 27. He regularly visited her in Manhattan, a New York Times report said.
"My brother and I are very close, I admire him enormously," Simpson told New York Times. Jobs said, "We're family. She's one of my best friends in the world. I call her and talk to her every couple of days."
Getting to know his sister, and learning how similar they were, had a major effect on Jobs. Steve Lohr of The New York Times wrote: "The effect of all this on Jobs seems to be a certain sense of calming fatalism -- less urgency to control his immediate environment and a greater trust that life's outcomes are, to a certain degree, wired in the genes."
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