[Diego1618]

Naturally, if one thinks these brethren were full siblings of Jesus, you don't believe that he was 'the only begotten Son of God', and are not any kind of Christian.

Are you admitting here that you believe Mary to be a god? Or are you just ignorant of the fact that they were progeny of both Joseph and Mary. Of course in that case they would be half brothers and sisters of Our Lord.

I'm quite positive that you don't mean that other children of Mary would be classified by your church as "Begotten" of God also.....do you?

And.....I am a first century Christian.....predating your outfit by at least 300 years.

[Lucius Cornelius Sulla]

Are you admitting here that you believe Mary to be a god?

You appear not to be following too closely here. Christ was not a blood relation to Joseph, he was begotten of God. If his brethren were full siblings then either they would have been begotten of God, and would be God themselves, or Christ would have been begotten of Joseph, and not God.

[Lucius Cornelius Sulla]

other children of Mary

A non existent group, see my above.