His eldest son , Thomas James Cahill , was elected to his father 's vacated seat of Cook 's River at the subsequent December by - election .
His eldest son , Thomas James Cahill , was served as an MP until 1983 .
His eldest son , Thomas James Cahill , was elected to his father 's vacated seat of Cook 's River at the subsequent December by - election and served as an MP until 1983 .