I do not buy into the idea of a parent being friends with their kids. You're meant to raise the child not to be their friends. That doesn't mean there shouldn't be room for your child to confide in you or have the freedom to express themselves with you. It just means there should be boundaries, let them know what's acceptable and what's not unlike their friend who would nudge them on no matter how bad it may be.

In the case of the story above, the parents chose to be friends rather than raise that girl from all indications. Everything that she was allowed to do under their roof shouldn't have been allowed.