How many pairs of brothers were listed among the twelve apostles?

The twelve are mentioned in Matthew 10:2-4. "Now the names of the twelve apostles are these; The first, Simon, who is called Peter, and Andrew his brother; James the son of Zebedee, and John his brother; Philip, and Bartholomew; Thomas, and Matthew the publican; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus; Simon the Canaanite, and Judas Iscariot, who also betrayed him." You can easily see two sets of brothers here: Peter and Andrew, the sons of Jonas; and James and John, the sons of Zebedee. In Acts 1:13, we see that James the son of Alphaeus had a brother in the twelve as well. It is probably Lebbaeus, surnamed Thaddaeus, but in Acts he is called Judas, the brother of James. In other places he is called Judas not Iscariot, to identify him apart from the Judas that betrayed Jesus. So there were three pairs of brothers in the twelve.