Luke 2:42 And when he was twelve years old, they went up to Jerusalem after the custom of the feast. 43 And when they had fulfilled the days, as they returned, the child Jesus tarried behind in Jerusalem; and Joseph and his mother knew not of it. 44 But they, supposing him to have been in the company, went a day's journey; and they sought him among their kinsfolk and acquaintance. 45 And when they found him not, they turned back again to Jerusalem, seeking him. 46 And it came to pass, that after three days they found him in the temple, sitting in the midst of the doctors, both hearing them, and asking them questions. 47 And all that heard him were astonished at his understanding and answers. 48 And when they saw him, they were amazed: and his mother said unto him, Son, why hast thou thus dealt with us? behold, thy father and I have sought thee sorrowing. 49 And he said unto them, How is it that ye sought me? wist ye not that I must be about my Father's business?
Now, isn't this something? The family left Jerusalem and forgot Jesus. It took a day to miss Him and three days to find Him. When they did find Him, He was in the temple.
Not too much unlike today. People leave church without Jesus and don't even notice. When they finally do find Him, it is at church, where they left Him in the first place.
Had they been busy about the Father's business, they would never have been apart from Him.