Some Objections to Continued Virginity
There are some very common objections to the belief that Mary remained a virgin after the birth of Jesus. The first objection considers the "brothers"
And “sisters” of Jesus from the Gospels.
Matthew 12:46-50; Mark 3:31; Luke 8:19
While he was still speaking to the crowds, his mother and his brothers (adelphoi) appeared outside, wishing  to speak with him. (Someone told him, "Your mother and your brothers (adelphoi) are standing outside, asking to speak with you.") But he said in reply to  the one who told him, "Who is my mother? Who are my brothers
(adelphoi)?" And stretching out his hand toward his disciples, he said, "Here are my mother and my brothers (adelphoi). For whoever does the will of my heavenly Father is my brother (adelphos), and sister (adelpha), and mother."
Mark 6:3
Is he not the carpenter, the son of Mary, and the brother (adelphos) of James and Joses and Judas and Simon? And are not his sisters (adelphai) here with us?