How do you handle Christmas shopping when you're low on cash? Do you feel pressured to buy for others, when they buy for you?

My schooling (masters) is sucking up my funds. I don’t have a lot of money to throw around right now, and Christmas, this year, has been tough, money-wise. My sister and my Dad like spending a nice chunk of coin on presents, and I feel pressured to get them something just as nice.