Use the Mistmantle Family Ring at Manor Mistmantle, north of town.
I'm afraid I cannot give Tobias the answers he seeks. But I can help you find the only person who can...
Take the ring into the woods to the north, to Manor Mistmantle, where Stalvan's body was buried. Enter, and hold the ring before you. Let the waning moon pour its light through the ring, and the spirits will answer your call.
Take heed, <name>. The questions of the living can offer more comfort than the answers of the dead.