How is Mary Still a virgin if she had all those kids?

Catholics, why do you believe in limited atonement?
Matthew 13:55-56 "Is not this the carpenter's son? is not his mother called Mary? and his brethren, James, and Joses, and Simon, and Judas?How is Mary still a virgin if she had all those kids?

We Catholics wrote it, I think we know what it means. the "brothers" were cousins or best Friends as was the custom in the Aramaic sense of the word brother ie an idiom for cousin or close one.The Doctrine of Mary's virginity and that of St. Joseph we have well documented and is a part of our history, but not yours since you have no direct lineage to Christ except as you broke off from a branch that was once connected to the kingdom of God/Heaven on earth.

Since conception involves love and marriage and fidelity, and since Blessed Mother was loved in a very deep and special way by the Holy spirit, in the Gospel we describe this chrism this Ecstasy with the Holy Spirit as being over-shadowed. Since she was loved by the Holy Spirit and her egg was fertilized in some mysterious manner by God the Holy Spirit, therefore the Holy spirit was her husband. Blessed Mother was married to God and remained faithful to Him throughout her life.

St. Joseph was a special man chosen from the beginning of time to be the step father protector and provider for Our Lord who humbled himself by taking human form and to be the companion and protector and earthly provider for Our Blessed Mother. Once Mary had conceived they both received the special graces that come with being chosen and in close proximity to God Himself.