Musannaf Ibn Abi Shayba 18:718

Abu Bakr narrated to us, he said: Abbad ibn al-Awwam narrated to us, from Ubaydah, from Ibrahim, who said: The confession of a young boy is not permissible. If evidence is established against him, it is accepted, and [the blood money/compensation] is upon the *aqilah* (the male paternal relatives).