What is another word for co-grandfather-in-law?
Pronunciation: [kˈə͡ʊɡɹˈandfɑːðəɹɪnlˈɔː] (IPA) 
Co-grandfather-in-law is a mouthful of a term, which refers to the father-in-law of your spouse's parent-in-law. The term may be too complex, so other synonyms have come about to describe the relationship as well. Some of these can be grandparent-in-law, step-grandfather, spouse's step-grandfather, or married-in grandfather. Grandfather-in-law can also be used to describe the relationship, though this can broaden its definition and perhaps be too confusing in some contexts. Whatever synonym one chooses, all refer to a familial relationship that is established through marriage and extended family relations. It's important to use context and audience when choosing the appropriate term to describe this relation.
