I actually read this recently...very interesting. I've learned a bit of Esperanto myself and if anyone is wondering, yes it is really easy to learn. My grasp of Esperanto grammar and vocabulary is significantly stronger than Spanish despite years of formal instruction in high school. Knowing a single word like "dento" for "tooth" tells me the place where a dentist works by adding "ejo" to the end and what a dentist is called by adding "isto" to the end of tooth. I still have a lot to learn, but a few root words gets you a lot of mileage with Esperanto.

Back to the article. It's always interesting how these families work that meet at Esperanto events. Hungarian is an extremely challenging language, so it sounds like her French father could only fully communicate with them in Esperanto. I bet your fluency goes up fast. I'm curious if there are words her parents had to invent if there isn't an Eaperanto word. I guess you could always describe a computer repairman some other way by adding electric-machine-fixer-man together or something like that...I'm sure this happens in other conlangs too.