After you arrive at the Tower in Old Town you will get a radio call from a man who is about to turn. He tells you that he has his young son with him and begs you to come and save him so that when he turns he does not bite and turn his son.
Whenyou reach the marker go inside and you find Sammy hidden in a cabinet in the bedroom. He is pretty freaked out - you have to talk to him to calm him down. You have to tell him that his dad is gone now - and you have to take him home to his mom...
You call Troy on the radio - she tells you that she will send a runner to get him in a few minites and she promises to take him back to the Tower herself if it is necessary. Cool that.
Now technically that wraps up the Side-Quest as far as you are concerned - you killed the Dad-Zombie, calmed the kid down and called for backup, so you do not have to wait around to actually SEE him get recovered. Right? Right!