User blog comment:D.Ryan/Big Brother Enemy Scorecard and Drawing/@comment-70.94.103.61-20101107200719/@comment-1330314-20101107205252

Alright. Little Brothers are failed experiments, so technically they're not trained for anything. Big Daddies follow an entirely different process to that of Big Sisters and, presumably, Big Brothers, since they have their vital organs removed and fused to their suits.