An ex-wife in-law is any former wife of your current husband that he had children with. Your drama with the ex-wife in-law will run far deeper than your other in-laws.
My ex-wife in-law struck again, this time she ruined the holidays for the children.
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The ex-wife of your ex-wife's husband.
She'd become a good friend when our spouses were having an affair, but she became my ex-wife-in-law when our ex-spouses got married.