Moses had a list of the 70 elders invited to the meeting tent. The disciples of Jesus kept mental track of who was "one of us." In today's readings, inclusion of others not on the lists caused consternation. God's lists are not ours.
Among those included as God's children are those who love Him and His Son Jesus Christ and show that love by worship and praise. Who never miss an opportunity to receive Jesus' Body and Blood in the Eucharist. Who don't simply tolerate others, but treat them with respect and compassion. Who express sorrow for offending God or neighbor. Who never deliberately hurt someone. Who make Jesus the center of their life.
That' what gets us included as a disciple of Jesus, not a list.