Ginny was Jesse Pinkman's aunt and the former owner of his house. She was diagnosed with an unspecified form of cancer and died seven months later. Jesse cared for her for much of this time. ("Crazy Handful of Nothin'")
Ginny is first mentioned when Walter White stops by Jesse's house, asking if it's his aunt's, but Jesse says that the house is his. ("Pilot") Later, Jesse realizes Walt has cancer by noticing the laser marks on Walt's chest and comments that his aunt had the same marks when she was treating cancer. ("Crazy Handful of Nothin'")
It is revealed that Jesse's house used to belong to Ginny before she died of cancer and his parents let him live there. When they discover Jesse's meth lab in the basement, they decide to kick him out of the house and sell it. Jesse complains to his mother that he deserves the house because he was the one who took care of Ginny while she turned her face. ("Down")
When Walt is insisting on killing a fly that entered their laboratory, Jesse tells the story of when an opossum took up residence beneath his aunt's house, he says that even after removing the opossum, she was still sure that it was still there. That was when they discovered her cancer had spread to her brain. ("Fly")
- It was never revealed if Ginny is Adam Pinkman's or Mrs. Pinkman's sister. At one point, Mrs. Pinkman looks sadly at a picture of Ginny, hinting that she possibly was her sister.