DeDe explained to Colorado...I mean Dil how 10 years ago they kidnapped him and made him their son. After that Dil decided to try to learn the language of the planet he came from. He went to the library and got a book called "Woh Er Kaeps Earth Segaugnal". It was the biggest book he had ever seen. It translated every Staffenhochtorian word into every language on Earth, from Afrikaans to Yiddish. There was no way for him to know which language was the one he was supposed to speak, so he had to learn all of them. 14 years later he had finally mastered all of Earth's languages, mostly English. He was now ready to tell his alien parents something very important. But not just that he now knew many more languages than Staffenhochtorian.
"Parents, there's something I need to tell you." Dil said.
"Yjim? (What?)" Stew and DeDe both asked.
"Oh yeah I forgot. Stnerap, sereh't gnihtemos P deen er llet uoy. (Parents, there's something I need to tell you.) P'm gniog kcab er Earth! (I'm going back to Earth.)" said Dil.
"Yu! (No!)" Stew and DeDe yelled.
"P tsum! (I must!) P tnaw er evil rew tser fo ym efil rew yaw lla fo as saw tnaem er eb devil. (I want to live the rest of my life the way all of it was meant to be lived.)" Dil said.
"Dna jgii woh si taht? (And just how is that?)" Stew asked.
Dil thought that that question had such an obvious answer, that he ignored it and didn't tell Stew. Dil walked into his alien parents' instant transporter and Stew set the coordinates for Tommy's house.
"Era uoy erus tuoba suyt Colorado? (Are you sure about this Colorado?)" DeDe asked Dil.
"P'm evitisop! (I'm positive!)" Dil answered.
"Ko, tub erofeb uoy og uoy deen er wonk taht uoy evah b rehtorb deman Tommy Pickles. (Ok, but before you go you need to know that you have a brother named Tommy Pickles.)" Stew explained.
DeDe came up to Dil and handed him a picture of Tommy.
"Suyt si yjim eh dekool ekil nehw ew detcudba uoy, tub taht saw 24 sraey oga os ohw swonk yjim eh skool ekil won. (This is what he looked like when we abducted you, but that was 24 years ago so who knows what he looks like now.)" DeDe said.
"Knaht uoy Rehtom. (Thank you Mother.)" Dil thanked.
"Won Colorado, uoy tog eno tsal ecnahc er yats erofeb P tih rew og nottub (Now Colorado, you got one last chance to stay before I hit the go button.)" Stew informed.
"P ediced er og Xsatyu. (I decide to go Father.)" Dil explained.
"Yrev llew, fi taht si yjim uoy esoohc. (Very well, if that is what you choose.)" said Stew.
Stew pressed the go button and Dil disappeared. Stew and DeDe began to cry because their "son" had left them.