Clarification of the Transmission Chain to ya'qub Ibn 'athim

Everything in this book that is narrated from Ya'qub ibn 'Athim has been transmitted by me from Muhammad ibn Musa ibn Al-Mutawakkil - may Allah سبحانه وتعالى be pleased with him - from Ali ibn Ibrahim ibn Hashim, from Muhammad ibn Abi Umayr, from Ya'qub ibn 'Athim. I have also narrated it from my father - may Allah سبحانه وتعالى have mercy on him - from Sa'd ibn Abdullah, from Ya'qub ibn Yazid, from Muhammad ibn Abi Umayr, from Ya'qub ibn 'Athim.