I am expected by my family to give Christmas presents to my nieces and yet my family give me nothing. What should I do?

Say no because.u simply dont have money or buy stuff in the sale. You dont have to do anything u domt want to remember that

It is fortunate that you have 11 months to figure this out.

My family lives with the traditional, "Christmas is family" thing.
Our household is the adults give the children things, the children give nothing, and the adults give each other things.
But I do feel like if they don't give you anything you don't need to give them anything. Embracing the relationships you have with them is most important.

Buy them gifts anyway as giving is more about the good person you are then the people receiving.

Give each niece and orange, or a shiny penny.

thats up to you what you want to do

Use your own skills to hand-make gifts for your nieces - it doesn't need to be expensive to be cherished. Friendship bracelets? Hair bows? Check Pinterest for ideas for inexpensive handmade diy gifts.
When you make something for a loved one, your affection for them grows too.

Buy them a llama.

Don't give anything to anyone who doesn't give presents back to you. Christmas gift giving is supposed to be reciprocal. Anyone who says otherwise is talking rot.

ignore your family's wishes
you decide who has been naughty and who has been nice

Make donations in their name to a charity.