house, taking trips to a local bagel shop, even the grocery store. he has made so much progress that his family decides to take their first vacation in seven years. the destination? nick's favorite place on earth. >> nick, you're at disney! >> reporter: this is a big deal. it's a big deal for our whole family. we all want to go home and talk about it. >> reporter: nick's older sister, tasha, says she's proud of her brother. >> it's a cause for celebration because he has come such a long way. he is as typical as i would love for him to be. >> reporter: even as nick's confidence is growing, he may not know what's about to happen when he turns 21. his family knows and can't help but worry. >> what are you most afraid of? >> pulling that plug. his world is going to collapse.