Any parent would, and should, be horrified by Kayla's decision to stay with Nick.
I get that it's 20 years of marriage and 5 kids. I could understand sticking around in spite of the polycule fallout and even the drugs fallout since that's on both of them. If both of them went radio silent and there was a short message that they were going to take time to fix their shit, I'd be applauding. But it's conduct during the aftermath that causes me to scratch my head and wonder why we haven't seen a divorce filing. April is still in the picture. April, who has said some awful things about Kayla and the marriage ("she doesn't love Nick for who he truly is," "looks like it's going to be me and you, baby," etc) and continues to live at the house next door while according to Kiki, also continues to be the side piece getting action when Kayla's not around.
April is secondary to Nick's actions. He who continues to have April's presence in their lives. He who allows April to continue saying horrible things, only putting his foot down when April mentioned Kayla's alleged tweeting (but not for anything prior). Nick who continually makes bad decisions that jeopardize his chances to be around his kids: the data breach, going on streams haggard and questionably sober, etc. Nick, who professed to miss his girlfriend and says how her vagina "is awesome."
If I'm Kayla's mother or father, I'm having the come-to-Jesus talk: It's better to be a single mother flipping burgers for minimum wage than tolerating this circus at the expense of her dignity. Better for the kids, too. What lessons re: motherhood and wifedom does she think her daughters in particular are going to take away from this, esp when they're older? When the daughters are old enough to conceptualize exactly what happened, I don't think they're going to be moved by the, "I stayed for you, sweetheart"-line.