“Christmas Day is the beginning, not the end, of the Christmas season! Our family chooses to recognize the traditional twelve days. We’ve found that observing Advent in the days leading up to Christmas, and then celebrating Christmas for twelve days instead of one, gives us a real opportunity to slow down, immerse our family in, and focus on, what God has done and is doing all year long!”
As the story goes, “My True Love” in the song refers to God the Father.
“A Partridge in a Pear Tree” refers to Jesus Christ and the cross.
The partridge is known for its fierce protectiveness of its young…being willing to give its life to defend them against any harm.
Some real insights at this link.