Hello @Joolz13 and welcome to you and your beautiful cocker spaniels and cats. I’ll just link a post here with many entries about Christmas sits.
Keep in mind the community of house sitters is a mixed bunch, and that’s an understatement. 
I’ll just say that ‘traditional’ is not always as relevant as you might think. For example, I’m a solo traveller with no immediate family. Most holiday seasons are quiet for me, and I often enjoy travelling to a sit during that time. Snuggling up to pets is sometimes my preferred and welcome company. 