When they could not find Him, they returned to Jerusalem to search for Him.

Luke 2:44
Assuming He was in their company, they traveled on for a day before they began to look for Him among their relatives and friends.

Luke 2:46
Finally, after three days they found Him in the temple courts, sitting among the teachers, listening to them and asking them questions.

And when they found him not, they turned back again to Jerusalem, seeking him.