Was Jehu the son or grandson of Numshi?

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Jehu was the son of Nimshi.

And Jehu the son of Nimshi shalt thou anoint to be king. 1 Kings 19:16

Jehu was the grandson of Nimshi.

And when thou commest thither, look out there Jehu the son of Jehoshaphat the son of Nimshi and go in. 2 Kings 9:2