They also said Sunday that they will put off until next February protests against a prosecutor who has charged their relatives in connection with the clash.
Six police officers also were killed in June when clashes broke out during the forced eviction of peasants occupying a disputed soy farm.
Politicians opposed to President Fernando Lugo seized on the "Massacre of Curuguaty" to oust him.
A prosecutor filed charges including land invasion and murder against eight of the peasants last Sunday.
Family members say the charges are baseless.
A local judge will decide Feb. 12 if he accepts or rejects charges presented by the prosecutor.