YA Fantasy series about sorcerers with the MC being the seventh son of a seventh son
It has been years, and I don't know if it is even finished, but it was a fantasy series, I think about a sorcerer's apprentice who was the seventh son of a seventh son, with them having to travel a lot, I think because they were being chased. The most unique detail I remember is that a relative of the MC was a ghost, and we learn they can't travel everywhere together because ghosts in the world can only travel to places they visited while alive. Many thanks for any help.