Kings III 11:19

19 And Ader found great favour in the sight of Pharao, and he gave him his wife's sister in marriage, the elder sister of Thekemina.

Kings III 11:19 In-Context

17 that Ader ran away, he and all the Idumaeans of the servants of his father with him; and they went into Egypt; and Ader a little child.
18 And there rise up men out of the city of Madiam, and they come to Pharan, and take men with them, and come to Pharao king of Egypt: and Ader went in to Pharao, and he gave him a house, and appointed him provision.
19 And Ader found great favour in the sight of Pharao, and he gave him his wife's sister in marriage, the elder sister of Thekemina.
20 And the sister of Thekemina bore to him, to Ader, Ganebath her son; and Thekemina brought him up in the midst of the sons of Pharao, and Ganebath was in the midst of the sons of Pharao.
21 And Ader heard in Egypt that David slept with his fathers, and that Joab the captain of the host was dead; and Ader said to Pharao, Let me go, and I will return to my country.

The Brenton translation of the Septuagint is in the public domain.