Just guessing. After a while the familial protection will turn to resentment. I assume that the Peterson family hocked all they had to pay for Scott's defense. It's all going to eventually grind on them. As well, someone will probably write a book and analyze all the dynamics of this sad tale.
Not in this co-dependent/enabling family.
They all did; the entire family.
It's all going to eventually grind on them
If they ever realize he's actually guilty, it's going to be ugly. They've given up everything to save his sorry a$$.