The mother, and the two girls, aged 8 and 12, each wore suicide bombs to one church, the two boys aged 15 and 17 rode motorcycles to another church, the father bombed a third church.
The attack is very advantageous for former general Prabowo in the upcoming 2019 Presidential election where incumbent moderate President Jokowi was winning fairly easily, despite support for Prabowo from Islamist paramilitary organisations, who yesterday declared they had 'weapons' ready to attack the US Embassy (over the move to Jerusalem).
edition.cnn.com/2018/05/13/asia/indonesia-church-attacks-surabaya/index.html