No, he did not have a family - his parents were dead and he died in a royal castle in France.
No body really knows how he died. He died around 1240 at the age of about 70.
No, Leonardo kept this painting. It was still in his possession when he died. It is a big mystery why he didn't give the painting to the Giocondos.
Leonardo Bistolfi died on 1933-09-02.
Leonardo Agostini died in 1669.
Leonardo Corona died in 1605.
Leonardo Sinisgalli died in 1981.
Leonardo Bazzaro died in 1937.
Leonardo Alishan died in 2005.
Leonardo Fea died in 1903.
Leonardo Vitetti died in 1973.
Leonardo Bianchi died in 1927.
Leonardo Dati died in 1425.