What is another word for co-mother-in-law?
Pronunciation: [kˈə͡ʊmˈʌðəɹɪnlˈɔː] (IPA) 
"Co-mother-in-law" refers to the mother of one's spouse's co-spouse. It is a specific term that may not have many synonyms; however, one could use "stepmother-in-law" or "mother-in-law of my spouse's partner" to describe the same relationship. Additionally, one could use colloquial terms such as "my spouse's co-spouse's mother" or simply "my in-law." In some cultures, such as in India, the term "saas" is used to refer to the mother-in-law of one's spouse's co-spouse. Ultimately, depending on the context and cultural norms, there may be various ways to refer to the same relationship.
