Writ petition

What is your locus standi in his personal matter? Why are you intervening in some others person matter? 

you did not stated any correct facts of your personal intervention

you cannot file any writ petition on the subject matter, but you can file a PIL, but for that also you need to have documentary evidences to prove your allegations, otherwise your case will not be entertained.

Allegations of illegal acquisition of property can fall under the purview of public interest. Therefore, as suggested by T. Kalaiselvan Sir, you can consider filing a PIL. However, in the absence of any documentation or evidence, proving unlawful acquisition could be difficult as the courts might not entertain vague allegations without supporting evidence. They require concrete evidence or specific legal grounds to initiate an investigation into property acquisition. Therefore, before taking any action, you must first gather substantial evidence or consult a lawyer to ascertain if there are grounds for initiating an investigation.