en_tn/2ch/21/06.md

walked in the ways

This is an idiom that means he followed their example. See how you translated this in 2 Chronicles 20:32. Alternate translation: "followed the example" (See: rc://en/ta/man/translate/figs-idiom)

the house of Ahab was doing

The word "house" is a metonym for the family that lives in the house. In this case it refers to the descendants of Ahab. Alternate translation: "the descendants of Ahab were doing" (See: rc://en/ta/man/translate/figs-metonymy)

he had Ahab's daughter as his wife

"he had married a daughter of Ahab"

in the sight of Yahweh

The sight of Yahweh represents his judgment or evaluation. Alternate translation: "as Yahweh judged" (See: rc://en/ta/man/translate/figs-metaphor)