And his {i} concubine, whose name was Reumah, she bare also Tebah, and Gaham, and Thahash, and Maachah.

(i) Concubine is often used to refer to those women who were inferior to the wives.

Matthew Henry's Concise Commentary

22:20-24 This chapter ends with some account of Nahor's family, who had settled at Haran. This seems to be given for the connexion which it had with the church of God. From thence Isaac and Jacob took wives; and before the account of those events this list is recorded. It shows that though Abraham saw his own family highly honoured with privileges, admitted into covenant, and blessed with the assurance of the promise, yet he did not look with disdain upon his relations, but was glad to hear of the increase and welfare of their families.

Matthew Henry's Whole Bible Commentary

Verses 20-24

This is recorded here, 1. To show that though Abraham saw his own family highly dignified with peculiar privileges, admitted into covenant, and blessed with the entail of the promise, yet he did not look with contempt and disdain upon his relations, but was glad to hear of the increase and prosperity of their families. 2. To make way for the following story of the marriage of Isaac to Rebekah, a daughter of this family.