lemme see...
mom lets this guy date her daughter adn she gets pregnant and has an abortion.
mom yells at daughter, but allows relatrionship to continue.
Daughter gets preggo a second time but miscarries. mom allows relationship to continue.
dad lies to church so the guy can keep his job whilst still dating daughter.
sounds like everybody around the kid failed the common sense test.
"sounds like everybody around the kid failed the common sense test."
Thereby failing her!
These are the kind of people who let boyfriends move in with their teenage daughters so they won't be out late at night.
Ultimately in a situation like this the option of last resort is to throw the child out. That is a very tough choice for a parent. No one can prevent a seventeen year-old from seeing who she chooses. In this case however, it sounds like the parents actually voiced approval of the relationship. Certainly they did fail this child.
Normally we would refer to the parents as white trash but in this case that would be insulting to white trash.