Hey, I don't know if I could throw my two cents in? I would say that your sister-in-law seems to be doing a good enough job of digging her own grave with the DWP. Tip offs are their primary tool but the DWP can and do investigate benefits claimants on their own initiative. Regular Facebook posts can help them determine her domestic situation. Furthermore, if you brother is living there, I am sure he is registered at her address e.g. receives bank statements there, correspondence from HMRC, potentially named on the gas/electric bill, on the electoral register from that address...... So there is every chance that t