That's a tough problem, JoanP. Two crucial points are, does your DIL get huffy about what you do with presents, and is your husband interested reading the books. If she cares, you have to keep them around for a while, but if not, you can hold for regifting or donate to a library. If you were in Portland, you could sell them to Powell's Books, but you would get a store credit, which only postpones the problem.
Christmas was wonderful, with a lot of people I love around me. I didn't get much serious reading done, though. It was mostly things like Dinosaur A to Z, read aloud to grandchildren.
JoanK and I used to have a standard present strategy. You give the other a paperback of a book you enjoyed. There is no particular expectation that the other will enjoy it, and no hard feelings if she doesn't. Sometimes it's a big success and sometimes it isn't, but it's fun.