Earlier reports indicated at least 10 people died, but Head Gen. Tito Karnavian, Indonesia's highest-ranking police official, told reporters seven victims were killed.
National Police Chief Tito Karnavian said the father exploded a auto bomb, two sons ages 16 and 18 used a motorcycle for their attack, and the mother was with her two young daughters for her attack. A new threat has emerged in the past several years, inspired by Islamic State attacks overseas.
Karnavian said Futrianto drove a bomb-laden vehicle into the city's Pentecostal church.
A mother and two daughters blew themselves up at a church, while the father and two sons targeted two others in Indonesia's second city, Surabaya.
Forensic evidence indicates the bombs were attached to the attackers' bodies, Karnavian said.
"Right now there are only three locations. We have identified one victim", he said.
Indonesia's Foreign Minister Retno Marsudi tweeted condolences to the bombing victims with the hashtags #UnitedAgainstTerrorism and #WeAreNotAfraid.
The US Embassy in Jakarta issued a statement condemning the Surabaya attacks.
Noting that the heinous attacks resulted in the loss of innocent lives and caused injuries to many, Singapore expressed its deepest condolences to the bereaved families and wished the injured a quick recovery. At the family's home, investigators found three plastic boxes containing pipe bombs, Surabaya police Grand Commissioner Rudi Setiawan said.
Image copyright Reuters Image caption Indonesian President Joko Widodo (R) visited the bomb sites on Sunday How does this compare to previous attacks?
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Indonesia, the world's largest Muslim-majority country, has seen a recent resurgence in home-grown militancy. Around 10% of the population are Christian.
They blamed the bombings on the Islamic State-inspired group Jemaah Ansharut Daulah.
In May 2017, two suicide bombers attacked a bus station in the capital, Jakarta, killing at least three police officers and wounding six officers and five civilians.
In 2016, ISIS said it carried out a suicide bombing and shooting near a Starbucks in Jakarta.
Also on Sunday, police said they killed four suspected members of JAD in Cianjur, in West Java province, and arrested two others.
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