Filippo Brunelleschi's father was Brunellesco Di Lippo who was a notary, that is a public official, in Florence while Filippo's mother was Giuliana Spini who was related to both the Spini and Aldobrandini families. Brunellesco and Giuliana had three sons, Filippo having one older and one younger brother. Certainly Brunellesco would have liked Filippo to have studied law with the aim of becoming a notary like himself but he was attracted to an artistic career and determined to follow that route.
Brunelleschi trained as a goldsmith and sculptor in a workshop in Florence, beginning his apprenticeship in 1392. An important influence on him at this time was Paolo dal Pozzo Toscanelli who was a merchant and medical doctor. Toscanelli's interest in science and mathematics was particularly significant for he taught his young pupil the principles of geometry. He also brought out Brunelleschi's interest in technology which he would put to good use later in his career.
While teaching at the Arte della Seta in 1401 Brunelleschi entered a competition proposed by the Lord of Florence to design the bronze doors of the Florence Baptistery. His panel:-
... of Abraham sacrificing Isaac showed a servant who, as he waits for Abraham and while the ass is grazing, is drawing a thorn from his foot.