1)
Why is no head listed for Bnei Shechanyah?
1.
Rashi: Bnei Shechanyah and Bnei Par'osh were one family; Zecharyah was the head. Ibn Ezra - it should have said Asher mi'Bnei Par'osh. It did not say so, to distinguish from "mi'Bnei Shechanyah ben Yachazi'el" (5).
2)
Why does it say "v'Imo"?
1.
Rashi: With his lineage, the males of his family traced their lineage.
