Real Estate Law
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You can file a joinder in this action under Rule 18 of the rules of civil procedure: http://civilprocedure.uslegal.com/rules-of-civil-procedure/the-federal-rules-of-civil-procedure/rule-18-joinder-of-claims/
You will need to file a motion to be joined as a party to the action.
The Rules of Civil Procedure do not have a form. However, the clerk's office may have one - you'll just have to ask. If they don't, you can try to contact legal aid and get forms or help drafting a petition.