Hours after the former leader's youngest brother Basil was arrested on his return from a trip abroad, another sibling, Gotabhaya, was hauled before the country's main anti-corruption body over claims of kickbacks he allegedly received while he served as defence secretary.
Gotabhaya, widely regarded as the real power behind 69-year-old Rajapakse during his decade-long rule, angrily denounced the Commission to Investigate Allegations of Bribery or Corruption (CIABOC) as he arrived at their headquarters today.
"At this rate, they can arrest the entire (former) cabinet for taking decisions. This is ridiculous.
"I have not done anything wrong. I was an honest government officer."
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Hundreds of Gotabhaya supporters carrying photos of him defied a court ban on protests as they massed outside CIABOC.
Many also carried doctored versions of the Sri Lankan national flag, without the green and saffron stripes that represent the minority Muslim and Tamil communities respectively.
Gotabhaya was questioned behind closed doors, although sources said that it was a brief session and he would return for a more lengthy interrogation early next week.
The 64-year-old, who has dual Sri Lankan and American citizenship, fled to the United States soon after his brother lost the January 8 election to Maithripala Sirisena, a former ally of Rajapakse before he jumped ship to challenge his old mentor.
The US embassy in Colombo said it could not comment on whether it was providing consular assistance to Basil, who faces two weeks in remand, "due to privacy considerations".
In an interview with AFP on Wednesday, Rajapakse slammed the string of corruption probes against his relatives as part of a "witch-hunt" instigated by his successor.
The former president had also been summoned to CIABOC tomorrow, but following a demand by lawmakers loyal to him, anti-graft investigators agreed to visit him at home and have not said when that will occur.
"I have received a letter from them (CIABOC) saying they will visit me to record a statement. They have not said when," the former president told AFP.
Parliament remains packed with Rajapakse loyalists, complicating the new leader's plans to overturn a raft of constitutional changes brought in by his predecessor, who awarded himself a host of new powers.