Pictures of the boy, Hussam Abdo, appeared on the front pages of all major Israeli newspapers on Thursday.
The family of the teenager said he was gullible and easily manipulated, and relatives demanded that militants stop using children for attacks.
"It is forbidden to send him to fight. He is young, he is small, he should be in school. Someone pressured him, maybe because they killed Ahmed Yassin," wailed Abdo's mother, Tamam.