--Mary and Joseph were cousins. Joseph's father's name was Heli. Mary was the daughter of his uncle Jacob. So, Jesus' step grandfather's name was Heli and his maternal grandfather's name was Jacob.
--Mary was the mother to at least 7 children, noting that there must be at least 2 daughters to state that Jesus had sisters.
--From Matthew 13:55-56 and Mark 6:3... Jesus' family consisted of his stepfather, mother, and his 4 brothers and an undisclosed number of sisters. The brother's names are given; James, Joses, Simon, Judas/Juda.
--James was not one of the 12. He is also known as James the Just. He served in the Church of Jerusalem and probably wrote the Epistle of James.
--We don't have any more information on Joses or Simon.
--Judas/Juda wrote the Epistle of Jude.
--It is assumed that Joseph died before the crucifixion, otherwise Mary would not have needed to be taken care of by John, as Jesus directed.