Is there an official big sister little sister program for Chinatown,
NYC?  (I can speak some mandarin but am not fully fluent.)   If not,
what is the closest alternative?

nyctraveler --

Here is contact information for the Big Brothers/Big Sisters programs
for Manhattan, New York City.  I am confident that a conversation with
one of them will help you to find an appropriate "little sister" match
in Chinatown.

Catholic Big Brothers of New York City 
45 East 20th Street 9th FL 
New York, NY  10003-1391 
(212) 477-2250 


BBBS of New York City, Inc. 
223 East 30th Street 
New York, NY  10016-8203 
(212) 686-2042 

 
Jewish BBBS 
120 West 57th Street 
New York, NY  10019
(212) 632-4515 


You can also apply online here:
http://hosted.bbbsa.org/big/ZipSearchResults.asp

If this information works for you, just donate the fee for the answer
to the program while you are at it!

Good luck.

markj-ga