Skyler actually does tells the cops to come over to remove Walter. Not that anyone believes she's going to tell them the part about the meth. Walt passive-aggressively clicks his pen and starts grading papers, while Skyler sits down and tries to not freak out. Then Flynn comes home. He sees his dad, jumps to the conclusions he wants to jump to, and Walter is only too happy to fire them up a couple of grilled cheese sandwiches as they laugh and bond and ignore Skyler entirely. The man is squatting and using his own son as leverage, which is as gross morally as it is euphemistically.
The cops show, which gets Flynn pissed off at Skyler anew. You can see the look of anticipation on Skyler's face as she waits for her son to start giving her hell. Sorry, call me a Skyler apologist, but I find this all pretty heartbreaking. There is absolutely nothing she can do that won't tear that kid up. Once they confirm that there's no divorce and Walt has joint title on the house, the cops know they're walking a tightrope. They clearly want to be able to help Skyler, looking for all the world like a battered woman. But they need her to say that he's been abusive, or else they can't remove him by force. To her credit, Skyler says he hasn't. Baby Holly cries, and Walt springs to pick her up, playing the doting father to the hilt. He sheepishly feeds the second cop a story about how "Gee, I haven't been the most attentive guy, and I guess that's why Wifey over there is flying off the handle like this."
Skyler's cop levels with her: "If you want your husband out of the house, you're gonna have to help me out. Is it possible maybe he's broken any laws that you know of?" He says even merely the suspicion of wrongdoing, and he can have Walt taken out of the house. She's got her opening, a mile wide. But Skyler looks over at Flynn, eagerly throwing her under the bus to the other cop. "My dad," he says, beaming with the pride of the hopelessly uninformed, "he is a great guy!" Skyler turns back to the cop, who says there's just no legal basis to remove Walt. He hands her his card and the honest hope that she can come up with a reason that lets him help her. After the cop leaves, Flynn yells at his mother, again, "Why you gotta DO this to Dad?" I'd normally have such little patience for a kid who yells at his mom this much, but he's as much of a victim here as anyone. Skyler takes the baby from Walt, fixes him with the glare to end all glares, and "welcomes" him home.