Dear Erika —
His family went to celebrate Passover, and that is the last that we know until His public ministry. There are some things that we can deduce accurately like that He was son of a widow and thus stayed and worked to support Mary until the time of his public ministry.
The Church has early stories and legends saved, of differing quality (some probably reliable and others fantastical), but there is no way to know anything else for certain about Christ.
The good news is that we know far more about Him, and with far more certainty, than we know of any historical figure of the time.