For our family it's simple: come hell or high water all the family try to get together, hopefully overnight, on Christmas Day or Boxing Day to exchange small gifts, eat, drink and generally enjoy time together. Aged from 3 to 90 and spanning 4 generations, we gather round a family tree, tiny ones collecting and distributing gifts from under the tree, older children reading tags and redirecting excited tiny hands to recipients. Finally we open our presents.
Our unique tradition is that Santa personally decides who's been naughtiest this year and instead of leaving them something nice, leaves them a bag of "stones".
A small bag of polished stones is left under the tree wrapped, sometimes in a small package, sometimes in a large box, together with a note from Santa explaining why the recipient has received these. Admittedly it's usually a male adult (often my husband!) who has done something silly/naughty (e.g. not washed the car often enough/not stacked dish washer, or simply eaten/drunk too much etc - any trivial but fun reason, really!). The kids love the built up anticipation of who is going to get the "stones" (and the relief of knowing that it wasn't them!). But who will deserve to get the "stones" next year (and why?) - only this year's recipient will know....!!
I don't actually know who/when it started (50+years to my knowledge) and I don't know any other family who does this but it's here to stay in my family, the little ones love it!!!