I'm going to tell my wife's family that they're cutting into my time with her
What kind of things do they do that cut into your time with your wife?
I'm pissed off, I had to listen to them for too long today
While it's normal to be annoyed at family members, you should be cherishing all the time you get with them to earn their respect and place as a real family member for them. You will always be able to be with your wife at others times.
Nah, I don't want to be with them, especially when doing normal family stuff, it's a waste of time.
Even if you don't enjoy spending time with them, they're still your wive's family. Have you ever thought about how she feels spending time with them?