I'm glad I learned Hebrew as a kid, but I wish my dad had taught me Yiddish; it was the language he fought with his parents in. (They spoke English fluently as a second language; he spoke English as a first language but Yiddish was the language for fighting with his parents.)

A friend of mine is the daughter of a hearing Child of Deaf Adults, and her dad never taught her ASL, which was his first language, so she never learned to speak to her own grandparents. It always made her sad.

We now know enough about brain development to know that multilingualism is good, actually, and teaching your kids all the languages in which you're fluent is good, actually.

Husband sux and should learn Irish if he's jealous. It's a cool language! It's full of random constanants!