The three were Payao Akkahad and Nathaphat Akkahad, the mother and younger brother of Kamolkade, a volunteer nurse who was killed by a sniper at Wat Pathumwanaram, and Pansak Srithep, the father of Samaphan, who was also killed in a military crackdown against the United Front for Democracy against Dictatorship (UDD) protesters in May 2010.
Mrs Payao and Mr Nathaphat were arrested at about 10.45am while distibuting the leaflet at the Chatuchak station of the BTS skytrain in a symbolic call for criminal action against Mr Abhisit and Mr Suthep after the Criminal Court on Thursday dismissed a lawsuit against them on murder and attempted murder charges for ordering the military crackdown in 2010 that killed and wounded a large number of people.
Mr Pansak was arrested about ten minutes later while dropping the leaflet from an overpass near Chatuchak Park.
The three were brought to Bang Sue police station for questioning.
A number of police were deployed in Chatuchak area on Sunday morning on learning of the plan to distribute the leaflet in a symbolic protest against Mr Abhsit and Mr Suthep.