Meryl Streep is going to win major awards for this season. But, I don't like how she has basically taken over the show, but "it is what it is", as the saying goes. I would like the show to focus more on the other characters and create new stories vs dragging out Perry's death. Not sure why the women just didn't tell the truth...If he was "attacking" someone, anyone is legally permitted to help defend and if he slipped, so be it. This case wouldn't take more than 10 minutes of a police department's time and effort, especially once they discovered all the husband's abuse in the marriage.
In addition, I seriously doubt any grandparent, especially a single one, would get any type of official custody of children, even in ultra liberal California. Sure, maybe limited "visitation," but not custody. Family courts today are very big on keeping family units together and unless the parent is a drug dealer, has a major addiction problem, or something very bad going on, the courts won't intervene. Grieving and some depression aren't even close for petitioning the court based on "changing conditions" and the grandmother was already getting liberal visitation, thus, she has no standing in court.