You are delusional. Scripture clearly says Jesus is the child of Mary. You can show NO Scripture whatsoever that shows Mary had another child. Yes, you can show Jesus had 500 Brothers. Yes, you can show Abraham and Lot were brothers. But you cannot show in Scripture that anyone other than Jesus was a child of Mary. Brother of Jesus, yes. Child of Mary, NO!
You are delusional
You are blind to the words of Scripture.
You look at Scripture through the lens of your man-made beliefs.
Really, then show us where Mary was sinless...Show us where Mary was a perpetual virgin...