tradition

What is this thing called tradition? Is all human behaviour relative, or are there universal rules? I don't know. After over a decade of dragging my mum to the pub on Christmas day for a beer, this year she described this pub outing as a "tradition". Result! My other tradition is to drink sake on new years eve. I am not sure how many years, I have been doing that. On reflection is has only been two years, so that is clearly not long enough to call that ritual a tradition. Particularly as this year my bottle of sake was actually from California. Next year, I will be more traditional with sake from Japan.