Onam’s sons: Shammai and Jada.
Shammai’s sons: Nadab and Abishur.

Nadab’s sons: Seled and Appaim. Seled died without children.

Amram’s children: Aaron, Moses, and Miriam.
Aaron’s sons: Nadab, Abihu, Eleazar, and Ithamar.

Abdon was his firstborn son, then Zur, Kish, Baal, Nadab,

Abdon was his firstborn son, then Zur, Kish, Baal, Ner, Nadab,

The divisions of the descendants of Aaron were as follows: Aaron’s sons were Nadab, Abihu, Eleazar, and Ithamar.

But Nadab and Abihu died before their father, and they had no sons, so Eleazar and Ithamar served as priests.