Maybe I'm wrong, but I have a nagging suspicion that this sort of letter disproportionately features a parent who speaks Irish Gaelic, Scottish Gaelic, or Welsh. I know it can and does happen with other languages, but somehow it just seems to me that it's usually a Celtic language we see this with. Maybe those other people don't let their partners boss them around, or maybe they do and never complain to advice columnists.

At any rate, the only correct response to "We should teach the baby French as well!" is "Great, I'll start doing Duolingo today and order some self-teaching books. And as they're both Romance languages and we're Americans, I thought we should add some Spanish to the mix! It'll be fun!"