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so mac was known as ronnie the rat in high school and in "Mac Kills His Dad" even his parents know him to be a rat and specifically tell him NOT to be one. what if it was mac who ratted out his dad, not even on purpose just by saying the wrong thing and never knowing when to shut up, and that's why luther got sent to prison. and that's what ruined his relationship with his parents forever (not that it was a loving healthy relationship to begin with but from the christmas episode we know it had its nice moments that mac latches on to as proof that his parents love him). anyways that's just a theory #mytheories