Can a person file a case even he is not related to the property concerned?

a certain person is filing a perjury case against my grandfather actually it has been dismissed & the resolution state that "there is nothing to support the allegation of the complainants as to the existence of falsity when in fact the complainant do not have the right to do so....." but now they are asking for motion for reconsideration but we dont received yet a letter from the office of the prosecutor wether the consideration is granted or not. what should we do to close this case? can we file a counter case against them (the complainants)? pls help!!! thank you...