The prime accused in the case, Chella Sridhar Reddy, who is into real estate business, and the eight others made the fake death certificates of the Customs superintendent and his wife, Rachakonda Police Commissioner Mahesh M Bhagwat said.
They also created another certificate in a false name, whom they claimed to be the couple's son and the plot's legal heir, with forged signatures, he said.
The accused further obtained certified copies of the sale deed of the plot, measuring 200 square yard, from the sub-registrar's office at Hayath Nagar by producing the fake certificates.
The couple came to know about the fraud in 2015 when they went to the sub-registrar's office.
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After gathering more information about the fraud, they filed a complaint with the police last week.
Based on the complaint, a case was registered under IPC section 420 (cheating) and other relevant provisions.
Reddy and eight others were today arrested during the course of investigation into the case, Bhagwat said.