Ser Piero da Vinci (1429-1504; not born in 1426 as you can now read everywhere; his eldest brother, born in 1426, had the same name, but died already in 1428/29), son of Antonio da Vinci (1373-1469) and Lucia (1393-after 1469); his uncle Francesco da Vinci (1436-1507) adopted him and through this act removed the stigma of his beloved nephew's illegitimate birth; Leonardo da Vinci should never forget what his uncle did for him, Francesco da Vinci was his "real father", and as it was tradition at his time he gave his first son the name of his "father" Francesco. The second son was named after his grandfather Antonio.

Caterina or Chateria, with whom Leonardo's father had a short love affair; she married Achattabriga di Piero del Vaccha in 1457

his Half-siblings:

from the third marriage of his father to Marguerita di Francesco di Jacopo di Guglielmo (1457- 1485):

1. his half-brother Antonio, born on 26th February 1476, deceased in 1490 (if he had survived his father, he would have taken over the office of his father - that was the tradition of that time; but his younger brother Giuliano followed his father in this position)
2. his half-sister Maddalena, born on 4th November 1477 and deceased on 26th or 28th November 1477
3. his half-brother Giuliano, born on 31th December 1478, deceased in 1525
4. his half-brother Lorenzo, born on 24th October 1480, deceased in August 1485 (probably buried together with his mother)
5. his half-sister Violanta, born on 27th November 1481, deceased after 1504
6. his half-brother Domenico, born on 20 March 1485, deceased in 1563

from the fourth marriage of his father to Lucrezia di Guglielmo Cortigiani (1459-1531):

7. his half-brother Guglielmo, born on 21st October 1486, deceased on 4th December 1486
8. his half-sister Margherita, born on 16th December 1487, deceased after 1504
9. his half-brother Benedetto, born on 18th March 1489, deceased in 1530
10. his half-brother Pandolfo, born on 28th July 1490, deceased after 1504 (in 1506 or 1520)
11. his half-brother Guglielmo, born on 6th June 1492, deceased after 1539 (probably in 1551)
12. his half-brother Bartolomeo, born on 30th July 1493, deceased in 1532 or 1534
13. his half-brother Giovanni, born on 9th January 1499, deceased in 1549
14. his illegitimate half-brother Gian Giacomo Caprotti, called Salaì, born in 1480, deceased in 1524
15. his illegitimate half-brother Bartolomeo, born on 29th June 1485 and deceased on 14th or 18th December 1485
16. a illegitimate half-sister, of whom we do not know the name, born around 1486 and deceased in May 1490
17. his illegitimate half-brother Lorenzo, born in 1487/88, deceased in 1544

Isabella of Aragon (1470-1524), Duchess of Milan (clandestine marriage in 1497)

two sons and three daughters: Francesco, born in 1498, Giovanna, born in 1502, Maria, born in 1503, Antonio, born in 1506, and Isabella, born in 1510

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