Santa Claus is a blend of an early Christian saint and the Norse god Odin, among other influences.
Early Christian Influence:
Although Santa Claus
is originally based upon St. Nicholas, a 4th-century Christian bishop
from Lycia (now in Turkey), the figure is also strongly influenced by
early Norse religion. Saint Nicholas was known for giving gifts to the
poor. In one notable story, he met a pious but impoverished man who had
three daughters. He presented the with dowries to save them from a life
of prostitution. In most European countries, St. Nicholas is still
portrayed as a bearded bishop, wearing clerical robes. He became a
patron saint of many groups, particularly children, the poor, and
prostitutes.
Odin and His Mighty Horse:
Believe it or not but the traditions of Santa Claus originated as Odin, Alfather.
A number of similarities exist between some of Odin's escapades and
those of the figure who would become Santa Claus. Odin was often
depicted as leading a hunting party through the skies, during which he
rode his eight-legged horse, Sleipnir. In the 13th-century Poetic Edda,
Sleipnir is described as being able to leap great distances, which some
scholars have compared to the legends of Santa's reindeer. Odin was
typically portrayed as an old man with a long, white beard -- much like
St. Nicholas himself.
Treats for the Tots:
During the winter,
children placed their boots near the chimney, filling them with carrots
or straw as a gift for Sleipnir. When Odin flew by, he rewarded the
little ones by leaving gifts in their boots. In several Nordic
countries, this practice survived despite the adoption of Christianity.
As a result, the gift-giving became associated with St. Nicholas -- only
nowadays, most people hang stockings rather than leaving boots by the chimney!
To learn more about Jól and how it is celebrated check out the main post Jól
Conclusion:
It would seem to me that Santa Claus is just another name for Odin (for which there are many). An alias he donned to survive the onset of Christianity. I would tell this to your children, and have them celebrate it in the old way. With boots filled with straw and carrots for Odin's Horse Sleipnir. And leave presents for them at Jól. Tell them that you never know if Odinn is going to stop by your house for assistance, and providing help on his great hunt will bring blessings to your house.To learn more about Jól and how it is celebrated check out the main post Jól