The Gospels states that John took Mary to "His own house" but the Gospel also give us a clue that John and his older brother James were very young by the way they behave. So from this, we can assume that John did not have his own house or wife or kids or estate but took Mary to his parents Salome and Zebedee house. Salome was Mary's younger sister making John Mary's nephew and Jesus' cousin. Remember that years later at about 25 years old John was still in Jerusalem not Ephesus or somewhere else. John is regarded as the youngest of the apostles and the Gospels give us a clue of his young age when Jesus had him resting on his chest at the Last Supper. John was not arrested at Golgotha giving us a clue also that he was young and harmless for Jews. He was to young to be considered a threat.
A messianic community existed at Ephesus before Paul's first labors there (cf. "the brethren"),[Acts 18:27] in addition to Priscilla and Aquila. The original community was under the leadership of Apollos (1 Corinthians 1:12). They were disciples of John the Baptist and were converted by Aquila and Priscilla.[49] According to tradition, after the Assumption of Mary, John went to Ephesus. Irenaeus writes of "the church of Ephesus, founded by Paul, with John continuing with them until the times of Trajan." From Ephesus he wrote the three epistles attributed to him. John was allegedly banished by the Roman authorities to the Greek island of Patmos, where, according to tradition, he wrote the Book of Revelation. According to Tertullian (in The Prescription of Heretics) John was banished (presumably to Patmos) after being plunged into boiling oil in Rome and suffering nothing from it. It is said that all in the audience of Colosseum were converted to Christianity upon witnessing this miracle. This event would have occurred in the late 1st century, during the reign of the Emperor Domitian, who was known for his persecution of Christians.
When John was aged, he trained Polycarp who later became Bishop of Smyrna. This was important because Polycarp was able to carry John's message to future generations. Polycarp taught Irenaeus, passing on to him stories about John. Similarly, Ignatius of Antioch was a student of John and later appointed by Saint Peter to be the Bishop of Antioch. In Against Heresies, Irenaeus relates how Polycarp told a story of
John, the disciple of the Lord, going to bathe at Ephesus, and perceiving Cerinthus within, rushed out of the bath-house without bathing, exclaiming, "Let us fly, lest even the bath-house fall down, because Cerinthus, the enemy of the truth, is within."
It is traditionally believed that John was the youngest of the apostles and survived them. He is said to have lived to an old age, dying at Ephesus sometime after AD 98.
An alternative account of John's death, ascribed by later Christian writers to the early second-century bishop Papias of Hierapolis, claims that he was slain by the Jews. Most Johannine scholars doubt the reliability of its ascription to Papias, but a minority, including B.W. Bacon, Martin Hengel and Henry Barclay Swete, maintain that these references to Papias are credible. Zahn argues that this reference is actually to John the Baptist. John's traditional tomb is thought to be located at Selçuk, a small town in the vicinity of Ephesus.
John is also associated with the pseudepigraphal apocryphal text of the Acts of John, which is traditionally viewed as written by John himself or his disciple, Leucius Charinus. It was widely circulated by the second century CE but deemed heretical at the Second Council of Nicaea (787 CE). Varying fragments survived in Greek and Latin within monastic libraries. It contains strong docetic themes, but is not considered in modern scholarship to be gnostic. - John the Apostle (Wikipedia)