Head north-west from the Sanitarium, towards the entrance to The Breach. Just south of Gate Guard Hollis, you will find two ghosts (point A on the map). Wait for them to finish their conversation, then talk to them and they'll follow you. Head east to the gates of Ascalon (point B on the map). When you reach there, their son, Toby and his aunt come out and they all have a tear-jerking reunion. Once this is done, talk to Elise for your reward.