Presidential Commission of Inquiry Into Serious Acts of Fraud and Corruption (PRECIFAC) questioned Shiranthi Rajapaksa over allegations of fraud.
Shiranthi was summoned over allegations that she had instructed the Housing Ministry to provide a house, belonging to the National Housing Development Authority, below the estimated value to her former media coordinating officer, the Colombo Page reported.
She was asked to record a statement regarding the alleged discrepancy under the previous Rajapaksa regime.
Shiranthi's questioning comes two days after Rajapaksa's 27-year-old son Yoshitha Rajapaksa was arrested along with four others and remanded in custody for nearly two weeks on charges of money laundering.
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Yoshitha, a navy lieutenant and the second son of Rajapaksa, was arrested and quizzed on Saturday by the police's Financial Crimes Division (FCID) at the Sri Lankan Navy headquarters over his involvement in the management of a private television company.
Former President Rajapaksa and his wife were also present in court as Yoshitha was sent to judicial custody.
Yoshitha was quizzed in connection with TV channel Carlton Sports Network (CSN) which had close links with the Rajapaksa sons.
The Rajapaksa family has faced many accusations of corruption and abuse of power since Sirisena ended the former strongman's 10-year rule. Sirisena's coalition had pledged to bring to justice the perpetrators of large scale corruption in the Rajapaksa regime.