I saw this question posted on Facebook and thought I'd post it here to get everyone's thoughts.
The thing I miss the most from my childhood Christmases is going to both sets of grandparents. We'd get together with my mom's side of the family on Christmas Eve. My grandparents lived in an old farmhouse that couldn't have been more than 1,000 square feet. My mom had 7 brothers and sisters, so by the time everyone was there with their kids we had a houseful! Then on Christmas morning, after we opened presents at home, the five of us would go to my dad's mom's house. Again, it was a small home, probably more like 800 square feet in size. My grandmother was always so generous with her sons, daughters-in-law and grandkids. She would usually fix a ham and a turkey and we'd eat most of the day.
All of my grandparents have now passed away. There have been many times that I'd love to visit them and just spend time with them, but I feel that way especially around Christmas.