Yes, you can make an appearance into the case as an interested party. However, because the tenant has an attorney, I always suggest retaining an attorney yourself when the other side has representation. Then your counsel can contact the tenant's attorney to discuss next steps going forward and to resolve the matter.
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Yes, you have various options. However, because the options can be detailed and complicated I suggest scheduling an appointment with an experienced attorney who handles these matters to discuss your situation further to obtain the best advice possible.
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Your status in the home depends, among other things, on if you have a valid lease. It is best to consult an experienced foreclosure attorney to determine your rights and protect your interests versus the owner of the home and the mortgage lender.
You should retain an aggressive foreclosure defense attorney who may be able to get the lawsuit dismissed. There may be defects in the complaint and supporting documents which would allow grounds for the case to be dismissed. That would at a minimum greatly increase your negotiating position before having to contemplate bankruptcy.