@Hollow7F wasn't it the granddaughter that was thirsty? I think she was quoting the show they were discussing, which featured love rivals, and that's why the last panel is the men wondering about the sudden step in their housewife/kitchen game. They're keeping their guard up.
@icarushector check ch 4, the mom is also hot for him, but i dont think baa-san now about her, she just got a bad feeling and yeah baa-san was probably quoting the show