My niece was an only child. When she was young christmas was spent at home with just her DP
Pantomime / Christmas Lights / Santa during December
Advent Calendar ( a refillable one hanging on the door she helped fill at the end of Nov with her favourite treats - changed every year ! ) & elf on the shelf 😳
Xmas Eve : a box with Xmas PJs / a film ( think polar express / elf ) a hot chocolate mix , popcorn or similar and a couple of silly presents like xmas hair clips . Put out snacks for Santa and Reindeer ( DP take some bites after niece went to bed
family PJ evening watching the film ( DP also got xmas PJs )
Christmas Day : Stocking at the end of her bed ( to keep her quiet for a few minutes while you get another 5 minutes shut eye ! )
Bites taken from snacks / pressies under the tree
Open pressies - have a big pressie but make sure there are several small ones to open as well - colouring books / crayons etc.
Traditional breakfast - whatever you decide to make it Bucks Fizz for the adults OJ with soda water for DC !
Niece responsible ( with help) to tidy up wrapping paper which usually covered the lounge and ‘help’ cook lunch with a suitable Christmas apron & cooking utensils
after lunch a walk outside to the local park ( new bike / scooter )
Home for hot chocolate & a Christmas film / play with new toys / read a christmas story.
Tea - buffet / minimal effort and a special desert think Christmas Colin the Caterpillar/ gingerbread house - niece got to choose what was in the buffet week before.
She is in her early twenties now and says these were her best Christmas’ rather than being with lots of other adults / family , watching awful films and the inevitable disagreements !
It will be fine you will make your own traditions and on the positive - no wider family disagreements, treading on egg shells and reeking of cigarette smoke. If you want to dress up for the day you can or if you want to wear lounge wear all day that’s ok too.