Like the dozens of snapshots hanging from a large picture frame on their dining room wall, Roberta and Eric “Sven” Svenonius can see memories of their son Caleb Tipton wherever they look. In the large stack of board games they walk past each time they enter their apartment. How, even at 28 years old, he loved to sit with his father for hours, fighting mythical creatures and saving townsfolk in Dungeons & Dragons.