An eight-year-old girl, who was reportedly with the family, survived the blast and was being treated in a hospital, said an East Java police spokesman.
"The perpetrators allegedly committed SARA (an acronym for hate speech about race, religion or ethnicity) through Facebook and was then secured by Aceh police officers on Monday, May 14, at around 11:45 pm", Aceh Police spokesperson Misbahul Munauwar told Detik today.
The attacks killed 25 people, 13 of whom were the suicide bombers, and injured dozens more. It met at the home of Dita Oepriarto, who led his wife and four children in an attack on three churches, East Java police Chief Mahfud Arifin told reporters Tuesday.
The attack came just hours after police said the family that carried out the church bombings included girls aged 8 and 12.
Daesh claimed responsibility for all the attacks in statements carried by its Amaq news agency.
The content of the films included footage from Syria and Iraq, as well as Isis attacks in France, and was meant to encourage those in the group to commit terrorist attacks, he said.
Three members of a third family also died when homemade bombs exploded in their apartment Sunday night, and three children survived.
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THE Department of Foreign Affairs says it "continues to receive information" terrorists are planning fresh attacks in Indonesia and has warned Australians to take particular care in the country over the next few weeks.
Twenty-five people have died since Sunday, including 13 militants and their children.
The three families are believed to members of the pro-Isis Indonesian militant group, Jamaah Ansharut Daulah (JAD). At least one fatality was confirmed, but initial reports said at least seven people were dead, including four of the attackers, and that 10 people were injured, including four policemen.
The building is located behind Taman police station in Sidoarjo Regency which is bordered by Surabaya city where three churches were targetted earlier in the day. Its leaders were killed in police raids and hundreds of militants were arrested. The mother and her 17-year-old daughter were killed when a bomb handled by the father exploded prematurely.
"Don't hesitate to demand they step down from their positions to give a chance to those who are more reliable", said Rachland. Using two motorbikes, they drove into the carpark where they detonated their waist bombs.
Elsewhere family and friends mourned the deaths of the 12 people killed in the church blasts.