Conversation so far:
When was Ferdinand Magellan born?
Ferdinand Magellan was born in the Portuguese town of Sabrosa in or around 1480.
Who was Ferdinand Magellan's family?
Ferdinand Magellan's father, Pedro de Magalhães, was a minor member of Portuguese nobility and mayor of the town. His mother was Alda de Mezquita.

Question: Who were his siblings if any?
Self-contained rewrite: Who were Ferdinand Magellan's siblings?