What the hell was wrong with 'Mom' for...
...when John and Tom come round near the end, holding a gun asking where Brandon is, and she tells them he's at Candace's house.
She knows how tempermental and unhinged John is, and even if she didnt care about what was going to happen to Brandon, surely she should have been thinking about Candace and the baby? And for all she knew, (which turns out to be the case), Lana could have been with Brandon.
Why doesn't she just say she doesn't know? Why doesn't she call the police immediately after they go?