A.T. Robertson Commentary Matthew 13:54

"And coming into his own country he taught them in their synagogue, insomuch that they were astonished, and said, Whence hath this man this wisdom, and these mighty works?" — Matthew 13:54 (ASV)

Is not this the carpenter's son? (ουχ ουτος εστιν ο του τεκτωνος υιοσ?). The wellknown, the leading, or even for a time the only carpenter in Nazareth till Jesus took the place of Joseph as the carpenter. What the people of Nazareth could not comprehend was how one with the origin and environment of Jesus here in Nazareth could possess the wisdom which he appeared to have in his teaching (εδιδασκεν). That has often puzzled people how a boy whom they knew could become the man he apparently is after leaving them. They knew Joseph, Mary, the brothers (four of them named) and sisters (names not given). Jesus passed here as the son of Joseph and these were younger brothers and sisters (half brothers and sisters technically).