7:4a In addition to them, according to their genealogy, they had 36,000 troops for battle,

Uzzi had 36,000 descendants in his family line who were men/warriors prepared for war. It was written in their ancestral records.
-or-
The descendants of Uzzi had many generations of soldiers listed in the books of their ancestors. There were thirty-six thousand (36,000) fighting men ready/enrolled for battle,

7:4b for they had many wives and children.

They also had wives and many children.
-or-
and their many wives and children.

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