Theresa will always remain in an unconscious, reflexive state, totally dependent upon others to feed her and care for her most private needs (emphasis added).
So, what? Nevertheless, her parents want to care for her at home, and they can do so. A feeding tube is a simple, simple device to operate. Even a ten-year-old could figure it out.
When Terri had the feeding tube put in - it was for convenience - not because she needed it.
Her husband/guardian thought it was too expensive to pay staff the extra money to feed her and he decided that the feeding tube should be used instead.