Can you get an oilcloth or a sheet of plastic to be able to cover the kitchen table or (preferably not carpet) living space floor? To allow lots of messy play and crafts. It might be an ideal time of year to do a lot of handprint art - like making brown paper into handmade (artisan) wrapping paper for Christmas (finger painting, potato stamping etc), or find ideas for different coloured finger prints to make pictures on the front of cards for various doting relatives....use all the empty toilet roll middles to make snowmen, santas, family of penguins etc to decorate the house for Christmas (whether all of the creations, or only just a handful, actually end up on display is beside the point - the entertainment and occupation of small DCs value is what is important here). Cut strips of different coloured sheets of paper (start with white paper and paint that if necessary) and teach them to make paper chains to string from the ceilings.
Intersperse with "quiet time" every day for reading where you read together.
Get them involved in preparing the family dinner - getting the ingredients or pots from lower cupboards, learning to chop properly, mixing things in bowls, measuring out ingredients, etc. If you have a sturdy stool that they can stand beside you at the worktop, or work together on the kitchen table sitting down, all the better.
And then tell them to go play with their toys (that Mamma also needs time to herself and a stiff gin) too.