That question pops up routinely in fantasy discussions. From Frodo Baggins to Richard Cypher to Daenerys Targaryen, few of them have parents. Even the best adjusted family in fantasy, the Starks, get themselves killed off, and the survivors qualify as orphans now. Well, to me, the answer is obvious.
You had a mother, didn’t you? Would she let you traipse across the country with a crazy old man hellbent on saving the world? I didn’t think so.
Get Mom and Dad out of the way, and the story can proceed.