I thought the brother was going to fall over with the baby in the pool.
Even if Hank does find out that Walt is Heisenberg, there is absolutely nothing he can do. It is even better for Walt, now that Hank knows. If Hank turns Walt in, he would ruin his whole family including himself. If anyone remembers, skank Skyler paid for his recovery with Walt's drug money. Even if Hank didn't know, there is no way he'll be able to prove it. Idk how much rehabilitation costs, but I'd guess around 100kish? I doubt anyone is going to believe him if he says he thought the insurance paid. If Walt goes down, so does Hank.