Wow! You didn't say how long you've been married so it's hard to say how long you've been living in "purgatory" so to speak.
I found the best way to deal with my late mother-in-law was to kill her with kindness. She and I were nothing alike; she was an alcoholic and I drank socially. She had my husband drinking with her as often as possible. I kept killing her with kindness until he saw through her.
Hon, seriously, don't say a bad word about them. Keep letting them behave like petulant children because they're jealous they have to share their son with you! That doesn't mean you have to act the same way. Just be the most loving, giving, attentive daughter-in-law one could ever want. You make them wonder, "What on earth is she up to? Do you think she's taking drugs? What has gotten into her?" It's the best revenge you could ever have for their past treatment towards you. Just be nice; then sit back and watch their reaction. Honey, I promise you it will one of the best floor shows you ever witnessed!
Not to mention, you'll have a better, closer relationship with your in-laws as a result. My mother-in-law and I became very close once she realized she couldn't beat me at the game... Go ahead, you go get 'em, honey!