No. Mary had no other children, she remained a virgin perpetually.
The scriptural reference to Jesus' brothers has to do with His extended family. The word for brother and cousin is the same; there is no distinction. You can search our database on this topic for extensive information.
Also, consider these points:
- Jesus gave his Mother to the beloved disciple (John) at the Cross. If he had immediate family that wouldn't work.
- If Jesus had brothers and sisters, He would likely have had nieces and nephews, and subsequent generations — there have never been any claims to legitimate descendancy from Jesus' family in the Early Church or ever.
- Finally, there is a consistent tradition which goes back to the Early Church, and just because it is tradition doesn't mean it is not historically accurate. It is. The Church has always held Mary to be a perpetual virgin, neither having other children or having sexual relations. Though she was married, she had given herself to the Lord in this way prior to her marriage (which was ordained by God . . . though Joseph's physical fatherhood was not required).
Remember how Jesus said some make themselves eunuchs for the sake of the kingdom. (Matthew 19:12)
- Are there any persons more likely to be so than the one who bore the Savior?
Consider how when the angel told Mary that she would be the mother of the Savior, and how she asked,
How can this be, for I know not man? (Luke 1:34)
That question would be absolutely idiotic for a married or engaged person, as if they have no idea of sexual relations and its consequences. Mary would have to be completely ignorant of sex, because she was already betrothed to Joseph, with whom relations would be natural and the subsequent pregnancy.
- How else can you explain her question with any plausibility?
Protestants have denigrated the role and virginity of Mary because they think Catholics are trying to make her a demi-God.
To the contrary, we are acknowledging the work of God, her Creator and ours, who did something marvelous. She is the new Eve, but unlike Eve who messed it up, she was faithful, and bore us the Savior. God's handmaiden. Give Him the glory for what He did in Mary because all generations do in the Catholic Church.
There is a lot more, so search our database. Also, search for for Mary and the Ark of the Covenant.