90 days rule is applicable to tenants living in the home at the time of auction. They are entitled to 90 day notice. I don't think you can avail this law. If you can't vacate the house right away, try to negotiate with new owners of the home. If you feel the foreclosure was unlawful or so, please contact a foreclosure attorney in your area.
You should see a lawyer who is well familiar with animal law. I think you have an action based upon breach of contract assuming you have one. I also think you can sue them for misrepresentation and fraud under tort law. But your recovery is limited either for contract or for torts. You can also go to Small claims court depending upon the value of your claim. I am not sure about your jurisdictional limitation on small claims.
You can assign rights and liabilities. For assigning liabilities you need to have consent of other person ( like written) otherwise it won't be valid. But, you will be still liable secondarily as surety or guarantor.
Meanwhile, send some written requests to all involved parties in your case via certified USPS. It will be useful as additional proof. If your claim is for less than $10,000, you can file a case against them in small claims court so that you can save some money on hiring an Attorney.
Looks like, your question involves more than a defamation point of view. It depends upon the content you intend to show, sometimes it may violate IP rights of a person. Most importantly, It may violate privacy rights of the person and could lead to law suit.