Peter, who had made contradictory statements on the relationship between Indrani and Sheena, was called for the first time for the probe to Khar police station where Commissioner Rakesh Maria was also present. His brother Gautam was also briefly questioned.
Khanna was also brought to Khar police station later in the evening for questioning.
Khanna was taken to an undisclosed location for joint interrogation with Indrani and her driver S P Rai, who the police said in a court had abducted 25-year-old Sheena in a car and took her to a forest in Pen town of Raigad district where they strangulated her.
Brought here from Kolkata last night, Khanna was produced in Bandra court and remanded in police custody till August 31 after being charged under Sections 364 (kidnapping), 302 (murder), 201 (causing disappearance of evidence) and 120-B (conspiracy) of the IPC.
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Peter, a media honcho, had maintained earlier that he was not aware till the other day that Sheena was Indrani's daughter and about the murder and his wife had had told him that Sheena was in the US.
But his son Rahul Mukerjea was extensively grilled by police for two days over his alleged relationship with Sheena, his step sister.
In a complex web of linkages of personae involved in the case, it is suspected that Indrani was opposed to Sheena's relationship with Rahul.