What does Matthew 12:47 mean?
This verse is not included in some early manuscripts of Matthew's gospel. Scholars think it might have been mistakenly added by some copyists, or included to harmonize the account with Mark. The translators of the English Standard Version (ESV) have chosen not to include it, though it does appear in the New International Version (NIV) and others.This verse repeats the end of the previous verse in the form of someone giving Jesus the message that His mother and brothers were outside wanting to speak to Him. What Matthew does not include that Mark's version of this story does is that the family had come to "take charge" of Jesus. They said, "He is out of his mind" (Mark 3:21).
This additional information tells us two things. First, Jesus' family did not yet believe that He was the Messiah (or they would not have said He was out of His mind). Second, they were still concerned about Him and either wanted to help Him or to remove Him from the public eye and further embarrassment. There's no way to know.
Once Jesus is told they are outside waiting for Him, he says a surprising thing about family (Matthew 12:48).
Matthew 12:46–50 finds Jesus teaching inside a house. He receives a message that His mother Mary and His brothers are waiting outside to talk to Him. In response, Jesus points to His disciples. He declares that anyone who does the will of His Father in heaven is His brother and sister and mother, establishing the idea that those who follow Christ and do God's will are meant to be connected like family.
Matthew 12 features confrontations between the Pharisees and Jesus over several issues. Among these are working on the Sabbath, healing on the Sabbath, and the source of His power to cast out demons. Jesus counters each argument and rebukes the Pharisees sharply for their obstinate unbelief. He even notes that those who maliciously ascribe His miracles to demons are unforgivable. He warns them, and the rest of their current generation, about the judgment to come. Jesus calls the Pharisees a brood of vipers and rejects their demand for another miracle. All they'll be promised is the sign of Jonah. The Son of Man will be in the heart of the earth for three days. Jesus also states that all who do His Father's will are His family.