The wisdom of a 5 year old man.

One of my summer school boys has the look of a man who has seen it all, twice. And for a 5 year old, that's saying a lot. 
   
He tends to be dramatic in his speech... for example, we got a new student on the last day of the second week of summer school. I explained to the boys, "We'll have to teach Tim the math games we learned." Alex jumped out of his seat and said, "Yeah! Literally ALL the games!" (accompanied by an expressive, all-encompassing hand gesture that almost smacked another child in the eye).
      
And he's obsessed with the concept of infinity: 
   
"It's so hot out today. It's like infinity degrees."
   
"How many pages are in this book?! It's like infinity pages!"
   
One day, Julio (who is 7 and bilingual) asked him what infinity actually means. Alex informed him that "it's the last number out of allllll the numbers in the world." I tried to tell him that infinity is just a word we use for a number we can't count, but it's not actually a number. Alex would have none of that, and went on to tell us what infinity would look like if you wrote it. 
   
"Infinity is one zero zero zero zero zero..."
   
"No, honey, infinity isn't a number, it's a word," I said. 
   
Alex continued, "... zero zero zero zero zero..."
   
"Al, you're still just telling me numbers."
      
"... zero zero zero zero zero zero..."
      
At this point, Timothy (6) interrupted him to explain that there IS no last number. "They just keep going!" he exclaimed.
   
"... zero zero ZERO ZERO ZERO ZERO..." (As if saying it louder would prove his point.)
   
Unfortunately, a conversation we had on only the 2nd day of summer school told me more than I wanted to know about his home life. 
      
We were transitioning from one activity to another when he suddenly asked, "Miss Adrienne? How was your life when you were a kid?"
   
Only slightly taken aback, I replied, "It was good. Why? How's your life as a kid?"
   
He then launched into a story about his mom and dad. "They fight all the time. They don't love each other anymore. They need their own houses, because they can't stay together. They don't even come inside, they just drop us off at the house because they don't want to see each other."
   
This is always a difficult task as a teacher. I have to find the right thing to say without making it into a super emotional moment. Since Alex delivered this news matter-of-factly, I kept my response simple. "Wow... I'm sure that's not easy on you and your brother. But sometimes if people don't get along, it's better for them to be apart until they can work things out. It sounds like you and your brother are doing a good job of dealing with it, and right now that's all you can do."
   
He nodded sagely. "Yeah. Now I just have to live life. It's hard to live life." 
   
(student names have been changed)