The reason why there are so many in-law jokes is because... well... you laugh or you cry. I love my father-in-law. My mother-in-law? She means well. But she's also an over-planning, worrisome, and intrusive nuisance! The only way I've found to deal with her is to ignore her for the most part. So when she shows up at our house with a stack of print-outs concerning something she researched on the Internet (anything and everything ranging from organic foods, relationship advice, child-raising tips, vacation spots, financial advice, and who knows what else), I smile and thank her... place the reams of paperwork on the coffee table... and throw them out when she leaves.
She's Christian (she's never announced what demonination--and I've never asked), and strongly disapproves of her daughter marrying an Atheist. Of course, she also strongly disapproves of my wife's Paganism, as well. So the showers of religious propaganda are regular. She's even taken to buying children's Bible stories and giving them to our daughter "as a gift." She doesn't disapprove of ME, mind you--just my views on religion.
I've pretty much accepted that she'll be a thorn in my side for as long as she's alive. It is comforting to remind myself that I married her DAUGHTER, not her.
My suggestion is to accept your in-laws for who they are--since I guarantee you can't change them. Also remember that no one is EVER good enough to marry your child; that's simply how the world is in the eyes of a parent, and I doubt that your in-laws see things any differently. It's most likely nothing personal.
Just don't let them move in. Or move in with them!