Conversation so far:
Where was Blind Lemon Jefferson born?
Blind Lemon Jefferson was born near Coutchman, Texas.
Who are Blind Lemon Jefferson's parents?
Blind Lemon Jefferson was born to Alex and Clarissa Jefferson, who were African-American sharecroppers.

Question: Did he have any siblings?
Self-contained rewrite: Did Blind Lemon Jefferson have any siblings?