Matthew 25:40 New International Version (NIV)
“The King will reply, ‘Truly I tell you, whatever you did for one of the least of these brothers and sisters of mine, you did for me.’
Who's brothers and sisters?
The king's.
Who is this king?
Jesus.
So, they're brothers and sisters of Jesus, however least they are.
Who are they?
They are whosoever received Jesus as the king.
God the Son calls them His brothers and sisters.
Just imagine them being God's brothers and sisters!
How proud and honored they should be,
and how carefully we are to treat each other, the image bearers of God the Son.
however insignificant or inadequate they look.