Sadly, I no longer have parents who are living, but I do have four siblings and lots of nieces and nephews. We started a tradition where every other year we all get together starting at noon and attempt to have a round-robin doubles tennis tournament at my sister's house. We also break out the martinis. The tennis starts out serious and gets more and more funny and silly the more martinis are consumed.
We do end up having a very nice, civilized T-giving dinner in the early evening.
I'm really not a fan of Thanksgiving, but I do look forward to this special time with my siblings and their kids.