Oh sure, you had to bring up the fact that Jesus had a brother and Mary had other children didnt you. :-)
lol! You don’t think it was too much TRUTH overload, do you?..:)
Please post the Scripture(s) that identifies anyone (other than Jesus) as a biological son or daughter of Mary.
I'll save you some time. You can't. It doesn't exist.
If you're going to complain about other people's allegedly "unbiblical" beliefs, you lay yourself open to the charge of hypocrisy if you yourself seek to bind other people to beliefs that are not taught in Scripture.