Conversation so far:
Who wrote Voltaire's biography?
Who were Voltaire's parents?
Voltaire's parents were François Arouet, a lawyer who was a minor treasury official, and his wife, Marie Marguerite Daumard, whose family was on the lowest rank of the French nobility.
Did Voltaire have any siblings?
Voltaire was the youngest of the five children of François Arouet and Marie Marguerite Daumard.

Question: What were his siblings names?
Self-contained rewrite: What were Voltaire's siblings' names?