This song is about Arthur McCloud abusing her daughter Cecillia (the main character), she was clearly raped as it suggests
"The sweat of your back, now sticks to the carpet,
As he moves himself out from the press" she tells her mother, Martha, but I don't think she does anything about it, until Cecillia ends up running away with her brothers (the missing McCloud Boys) at which point Martha decides to "do it myself so it's done". This could be reffering to either the actual killing of Arthur or simply disposing of his body (Cecellia may have already killed him).
This song is about Arthur McCloud abusing her daughter Cecillia (the main character), she was clearly raped as it suggests "The sweat of your back, now sticks to the carpet, As he moves himself out from the press" she tells her mother, Martha, but I don't think she does anything about it, until Cecillia ends up running away with her brothers (the missing McCloud Boys) at which point Martha decides to "do it myself so it's done". This could be reffering to either the actual killing of Arthur or simply disposing of his body (Cecellia may have already killed him).