Who is Bob Anderson from Mortal Fear and what is their importance?

Bob Anderson is Bob is Drewe's father. Harper notes that Bob is outspoken and has definite ideas about patriotism. While Harper may not agree with many of Bob's stands, he notes that Bob has served his country in the military and that is reason enough to remain quiet about the aspect of Bob's philosophies with which Harper doesn't agree. After Erin's death, Bob asks Harper if he knows the killer. When Harper says he knows who killed Erin, Bob demands that if there comes a time Harper has access to the man, he'll notify Bob. Harper agrees and when that time comes, he calls Bob. Though Berkmann is mortally injured, he is still alive when Bob arrives. When Bob learns that Berkmann is the killer, he returns to where the man lies on the ground. When he returns to Harper's location, he says simply that Berkmann is no longer alive.