I got beyond that when I got fed up with BIL demanding a $50 gift, and what we got back was $2 of candy canes (which neither of us like) or some equally chintzy and useless gift.
I announced that because of my CFS, it was hard enough to shop for my own family, and therefore, spouse was responsible for the cards and gifts for his family. It took a couple missed birthdays before it sank in to him that I really did mean I was abdicating responsibility for his relatives, and it was his problem now. And when they weren't happy with his choices at Christmas, I reminded them that I had serious health problems and could no longer do it all.