Growing up, Christmas dinner was at Dear and Papa's, aka "the big house." Dear was my grandmother's first cousin. My grandmother was an only child and back in that day (maybe a century ago) she and her cousins Frances and Horace Jr. were raised as siblings. They were very close to each other throughout their lives.
Christmas Dinner was at the Hill's, and by the time I came around Frances (Hill) Caldwell was the matriarch and dinner was at her house (Dear and Papa's). (Horace Jr. was alive but as I recall he had Christmas dinner with his wife's family.)
Using temporary side tables, they could seat about a sixty in the dining room.
Like I said, "the big house."
Growing up, we would rush down to the fireplace Christmas morning, bask in the glory that was Santa (little baby who?), have a family sit-down breakfast, then settle into gift-exchange and exploring what was under the tree before getting dressed into formal attire for dinner with all the cousins at the big house.
As Christmas Dinner (capital C, capital D) was at someone else's home and with a great deal many others, formal Christmas Dinner hosted by my mother for my immediately family was Christmas Eve, ending just in time to leave for the candlelight service at church.
As time has gone on, my generation has grown, married, and in the case of the cousins, spawned like rabbits. Regardless that Dear and Papa have both passed on, there is no one house who can host us all (Heck, Cousin Ann, my mother's generation, has like 15 grandchildren now—in high school). Christmas Dinner on Christmas Day with the extended family hasn't been for years.
I say all this to explain why my family's Christmas Dinner (Capital C and Capital D) is on Christmas Eve. And it too has grown, but the seated dinner itself is limited to the immediates: Hardcastles and in-law relatives.
My mother, loving character that she is, expanded our Christmas Eve many years ago to include holiday orphans and the very close family friends. And Hardcastle-annexes, such as the Halls (their own parents absent, Hartley and Carolyn refer to Mom and Dad as the DPs: Designated Parents.)
Christmas Eve is now an event at the Hardcastle household. Cocktails with the loved ones, followed by the seated dinner with the family. Not that those adjectives are mutually exclusive.
And of course, as it was Baby Leland's first Christmas, it was very Leland-centric.
Gifts for Leland were apparently unnecessary as he is perfectly happy eating all paper and bows within reach.

To the chagrin of my often-babysitting mother, someone taught Leland about the stairs, and much time was spent climbing.

Up and down and back again.

All in all, a lovely and loving Christmas Eve:
Nan, Helena Lamb, Emily Hardcastle, and Little Baby Leland
The Hall Family Photo:
Suspected Homosexual Longtime Bachelor Cousin Bruce (visiting), Carolyn & Hartley Hall, Grace Hall
The Hardcastle Boys: Jay, Mac, Wilson, Papa John, and Leland
Christmas Eve dinner is a big production. Even with "help," cocktails for 40+ and formal dinner for 15 with all the trimmings and all the settings, the effort Mother makes is Herculean. I helped as much as I could (largely as human ladder), but I also had to wrap all of my presents, and Dad's, and some of Mom's, for the morning—and play Santa Claus. With my parents overwhelmed with many things these days, I have taken over shopping for and stuffing of the eight stockings. Pretty much for all of the Christmas season, I am Head Elf at Sheppard Place. And I'm happy to do it.
Mom managed to finish cleaning up for dinner and prepping for breakfast around three-something. I didn't finish the clearing, wrapping, and stuffing until after four. I went to check in on my parents, who were so adorable I had to take the picture— curled snug in their bed, in identical poses, on a cold winter's night, and on the night before Christmas.

The sound effect of the camera opening roused my father. Mother, I imagine, remained entertained by visions of sugar plums.
Merry Christmas to all, and to all a good night.