Hi Missflip,
Co-dependancy comes to mind when I read your post.
Your husband is right. YOU need to set the boundaries.
Nothing grips ahold of you unless YOU let it.
You stated perfectly what you desire in your post and everything sounds very reasonable. Quit thinking about what your parents are feeling and starting thinking about what you want.
I agree with your husband. He works all week and looks forward to spending the weekend alone with his wife and child alone. You can't let your parents consume your life and happiness. They need to find new things to fill their lives with and you can't responsible for that.
I'm just saying that you really need to set the boundaries and start speaking up for yourself. It doesn't have to be harsh....just a matter of fact of this is how it is.
If you can, I strongly suggest you read the book: Codependent No More by Melody Beattie. This book was a lifesaver for me.
Best wishes.