Right of action

Generically speaking;Yes.

You may show the docs on record to your own counsel at your own location specializing in such/property matters.

Preferably try to settle the matter amicably.

Thank you so much :D

In another decade or so D will get ejection orders.  Then another half decade to execute the ejection orders. That too if your advocate files the case.  Or else there are many advocates who just take fees and dont file case at all and keep taking fees at regular intervals.  Be aware.

First Try amicable settlement.