Determined to uncover the truth, I invited MIL over, playing it cool like nothing was wrong. 'Could you give us some advice on home security?' I asked sweetly, as Sarah nodded along. 'Oh, happy to help!' MIL responded, looking curious. As we talked, I steered the conversation toward the cameras, eager to see her reaction. Her eyes widened, feigning surprise, as if this was news to her. I wasn’t buying it.