Bastard Out of Carolina Family Quotes

How we cite our quotes: (Chapter.Paragraph)

Quote #10

Once I was born, her hopes had turned, and I had climbed up her life like a flower reaching for the sun. Fourteen and terrified, fifteen and a mother, just past twenty-one when she married Glen. Her life had folded into mine. (22.59)

So far, we have been using "family" to mean the entire Boatwright clan, but this quote reminds us that Anney and Bone too are family, and they have the closest bond you can get, at least in terms of biology. What does it mean that Anney's and Bone's lives are folded together, especially in light of Anney leaving?