Math 12:50 defined His Brothers very broadly, saying: everyone that does the will of my father is my brother- Prologos
In the context on Math 12:50, it just seems to me that Jesus is only referring to spiritual relationship instead of blood relatives in a general sense although it would be also accurate to say that given wt teaching on the heavenly class of Christians, all Christians back then were Jesus' anointed brothers -I could be wrong. But neither does Mathew 12:20 invalidate what you state nor the possibility that in the aforementioned parable Jesus is referring to his brothers in the context of Hebrews 3:1, Galatians 3:15-16,26,29. At the very least wt theology defining a heavenly class and earthly class is possible.
In my post that you are referring to, I was not showing that wt interpretation of said parable is correct, but that given that it is, it is also internally consistent.
In the related parable ALL nations refer to Jesus as Lord-even the Jews. This is not because any one of these people standing before Jesus ever believed in Jesus at all, but because the Bible makes it crystal clear that every will see him and will have to acknowledge his authority and in that context they call him Lord. This parable only considers one facet of the basis for judgment, namely actions towards Christ's brothers -there are other facets to also consider. According to this parable though, actions towards Christ's brothers is a requirement for salvation. In his post nmt argues that: how should the so called goats have been required to act towards an entity unidentified to them and therefore in order for wt interpretation of the parable to be consistent, goats must mean jw that do not preach, etc., and does not apply to non-JW because non-jw do not recognize "jw anointed" to mean Christ's brothers. But if that was the case, it should also be the case that all nations forced to stand before Jesus in judgment should be able to argue that they did not know the identity of Jesus either, but the parable does not allow for that excuse. According to the parable, everyone -not just jw- is required to support Jesus' brothers, regardless of what that means .Although nmt linked spreadsheet purporting to show wt changing interpretation of elements in the related parable, such does not change God's requirements for salvation.