Joao Francisco is Baltasar's father who lives in the district of the village of Mafra with his wife and Baltasar's mother Marta Maria. He is a farmer.
Joao Francisco is, similar to his wife a man of his times. Simple and honest, straightforward he shares in his wife's joys and suspicions over his son's strange wife, but is happy to accept their love for each other. He starts to protest their actions however when Baltasar moves away to Lisbon (to work on the airship), but knows that he is helpless to stop his son. After losing his wife he becomes a smaller, more feeble man and a figure who encourages sympathy from the reader.