There are a lot of spurious writings about the childhood of Jesus but none of them are the word of God. We may be intrigued by these stories, but rest assured, God has given us everything we need to know about Jesus in the Bible.
They could not come back to the physical land of Israel (own border) because they were dead, but they will stand in the resurrection in the new Jerusalem for all eternity!
Luke turns our focus from the law to Christ. The law points to the righteousness of God, so it is important. However, Jesus is the fulfillment of that law for us.