What was your favorite family tradition when you were growing up?

I don't know how it originated.  It must have been one of those traditions that just was without a real beginning.
We would go to midnight mass for Christmas and when we came home in the wee hours of the morning, there would be a big pot of chili on the stove for us.  It warmed our bodies after the walk home.  It wasn't a long walk but in the early morning hours of the 25th of December in Illinois, you could get cold quickly and you needed a sharp jolt of warmth to get the blood circulating again.  It was so good with some of Mom's homemade bread to sop up the liquidy bits.  That was heaven.
Another tradition which was sometimes annoying was the placement of Christmas presents and Easter baskets when we were school age.  When we were very young, presents and candy were placed in obvious places such as under the Christmas tree or on the dining room table.  As we got older, the task of finding our presents and candy became much more difficult.  One year, I found my Easter basket inside the piano.  I had to take off the board on the bottom just above the pedals and there is was.  We would have to look all through the house to find our gifts.  At least, we worked off some calories finding the candy and cookies.
We had a daily tradition of eating the evening meal all together sitting at the table with Dad at the head and Mom sitting next to him.  The rest of us would sit in our usual places and wait while the food was passed around to each person.  There would be a chorus of complaints if one of us took too much of a favorite leaving the rest with a much smaller portion.  That was a good tradition.  It brought us all together every day sharing our blessings in the form of a tasty meal.