Speers was also the only person who would speak Klingon to Alec and the boy never saw Star Trek during this experiment, so didn’t ever see anyone but his father speaking it. As everyone else spoke English, Speers stated when Alec was about three years old, “He stopped listening to me when I spoke in Klingon. It was clear that he didn’t enjoy it, and I didn’t want to make it into a problem, so I switched to English…”

Today the teenage Alec no longer is fluent in Klingon and reportedly can’t even pick out the meaning of individual words of the language.

Wow