On the 9th of July 1504, Wednesday, at seven o’clock, died Ser Piero da Vinci, notary at the Palazzo del Podesta, my father, —at seven o’clock, being eighty years old, leaving behind ten sons and two daughters.
[Footnote: This statement of Ser Piero’s age contradicts that of the Riassunto della portata di Antonio da Vinci (Leonardo’s grandfather), who speaks of Ser Piero as being thirty years old in 1457; and that of the Riassunto della portata di Ser Piero e Francesco, sons of Antonia da Vinci, where Ser Piero is mentioned as being forty in 1469. These documents were published by G. UZIELLI, Ricerche intorno a L. da Vinci, Firenze, 1872, pp. 144 and 146. Leonardo was, as is well known, a natural son. His mother ‘La Catarina’ was married in 1457 to Acchattabriga di Piero del Vaccha da Vinci. She died in 1519. Leonardo never mentions her in the Manuscripts. In the year of Leonardo’s birth Ser Piero married Albiera di Giovanni Amadoci, and after her death at the age of thirty eight he again married, Francesca, daughter of Ser Giovanni Lanfredi, then only fifteen. Their children were Leonardo’s halfbrothers, Antonio (b. 1476), Ser Giuliano (b. 1479), Lorenzo (b. 1484), a girl, Violante (b. 1485), and another boy Domenico (b. 1486); Domenico’s descendants still exist as a family. Ser Piero married for the third time Lucrezia di Guglielmo Cortigiani by whom he had six children: Margherita (b. 1491), Benedetto (b. 1492), Pandolfo (b. 1494), Guglielmo (b. 1496), Bartolommeo (b. 1497), and Giovanni) date of birth unknown). Pierino da Vinci the sculptor (about 1520-1554) was the son of Bartolommeo, the fifth of these children. The dates of their deaths are not known, but we may infer from the above passage that they were all still living in 1505.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.