Co-mother-in-law

After dinner, the discerning eye of the co-mother-in-law divines the work of darkness. Your wife also is an expectant mother !

She had a right of entrée to the Castle now as prospective co-mother-in-law with the duchess, and made the most of it.

[…] responded with temper and irritability toward her step-daughter, Anna, who was so demure and so complete a member of the new society, and toward Ngaoli, her co-mother-in-law, gaunt, old, married under the old system, a devoted church member, righteous mother of five children, who fortunately had no complications in her life.