Hello. Take my advice and just remember that you are in the middle of a learning process on this deal.
Maybe not now, but sometimes or another all the pieces will fit together. It is just as possible that Levi
was a son/grandson/nephew or relative of Lemuel.
One thing about oral history is that it is told and retold to the best of a person's ability to recall the story
and sometimes, it jumps track, so while it is a good place to start, it is probably not a good place to end.
That is called the voice of experience.
Good luck.