Ive always been lucky because my kids have never argued or fallen out much. But one thing that has set them off each year is "Who arranged the Nativity scene last year". They refuse to share this task as each has their own distinct ideas of how it should look. Last year, fed up with his bossy big sister always winning the argument, the young man decided to create his own stable and scene using his favorite creative medium - LEGO. Its so brilliant that it has become part of the trimmings now.
If you look closely, you will see that Yoda plays the part of baby Jesus, with Hermione Grainger and Harry Potter playing Mary and Joseph. One of the 3 Kings is riding a 3 headed dog. There are little treasure chests full of gifts.