4 .
What Jesus did during the 15+ years between the first Temple visit (as in question 3 above) and the start of His ministry, is completely unspecified in the Gospels ~ but therefore quite intriguing. (What was Jesus like as a teenager, for instance: did he sulk and bang doors, as many 'typical human teenagers' do?)
There is at least one quite well-established legend ... at which point of the following, do you reckon, might one first have serious doubts about this story?
If Joseph died between Jesus' ages of 12 and around 30, we might fairly assume he did so about halfway during that span, i.e. when Jesus was barely into His twenties. We know from mentions later in the Gospel there were either younger half-siblings (natural children of Mary by Joseph) ~ or perhaps step-siblings from a previous marriage of the widower Joseph ~ and we may suppose that Jesus would have felt responsible for looking after these others, or at least supporting them and Mary, while helping carry on the family business in the building trade
We also know from later on (when Jesus was dead and needed burial) that an influential businessman and council member called Joseph of Arimathea made his grave available. It is believed that he had known, and perhaps supported, Jesus' earthly father Joseph through mutual involvement in the building business. If so, he might well have been saddened when 'father' Joseph died, and wanted to continue to support the young Jesus as a kindly mentor
Joseph of Arimathea had active interests in the export and import of construction materials such as lead and copper, which were not naturally available in the Holy Land. He had connections and contracts across the reach of the Roman Empire, right as far as the mines of southwestern Britain which produced copper and tin ~ useful materials for ornamental and decorative fittings on building projects, such as handles and hinges. Once others in Jesus' family were old enough to be left with Mary, Joseph could well have invited Him along on trade trips to inspect his supply chain and see some of the wider world
At some point in those fair few years, Joseph might indeed have brought Jesus to the shores of Britain to help inspect the tin-mines of our West Country. Hence William Blake's Romantic poem 'Jerusalem' which has almost become a second national anthem: 'And did those feet, in ancient time, walk upon England's mountains green ... ?'