If a brother or sister sins, go and point out the fault, just between the two of you. If they listen to you, you have won them over. But if they will not listen, take one or two others along, so that “every matter may be established by the testimony of two or three witnesses.”

Most and the oldest greek textes say "... if a brother sins" - is much more general that Jesus can chenge us through our brothers and sisters. It describes the way as Galatiens 6, 1 and Romans 15 also does. Important !