"And there’s both, Mexican children who are orphans tend to live outside when they don’t trust anybody"

A question:
The colocation of "there's both" is correct? And if that's right, how I would know when to write "there's rather than "there are"?

My question is because "There are" is used in plural and "there's" In singular and the word "both" is plural.
Why says there's both?

Question

"And there’s both, Mexican children who are orphans tend to live outside when they don’t trust anybody"

A question: 
The colocation of "there's both" is correct? And if that's right, how I would know when to write "there's rather than "there are"?

My question is because "There are" is used in plural and "there's" In singular and the word "both" is plural. 
Why says there's both?

Answer

Just like in any language, there are grammar rules that aren't always followed by native speakers. This is one of them. Many native speakers will use the more informal "there's" for both singular and plural, especially when speaking. You can also use it in speaking and it won't be noticeable; however, writing can be more formal and you should try to use the correct subject-verb agreement. Informal writing like text messages could also use the "there's" without issue. I usually recommend as a non-native speaker to try to follow the grammar rules as much as possible. Great question!

Answer

Using "there's" with a plural subject is becoming widespread. It's not something I ever use and I don't recommend it, but I see and hear it regularly-- even from natives.

Answer

Notwithstanding, don't write out "There is both."