But seeing as how we're all grown ups here, it seems daft to get so hung up on a term.
The reason that it's not 'daft' to get hung up on a term should be obvious. There are terms that we don't use these days that used to be part of normal, everyday speech. They were stopped because there were offensive and damaging. We don't use them now. This phrase is another that should be consigned to the 'out of date' bin.
Those who have experienced the above can quickly identify with "mini wife" and know exactly what each other means. Most women are good and sensible an don't need to spell out the intention of their every word.
That phrase only applies to 50% of the population, the females, so what is the 'go to' phrase for the other half? There isn't one, so the argument that people need and quick, easily recognised phrase doesn't really hold up.
Talking of emotional incest, this reasoning would suggest that 'spousification' is abuse of the child by the adult, provided that the child is too young to consent.
When the child is too young to consent, incest may also be child abuse. But between two consenting adults, incest (emotional or physical) is not abuse. Both parties are considered equally responsible.
So when women, and it is usually women, post on mn about what they see, I think it's important that posters point out to them that the child is being abused.