Well, you just need to make sure that the person taking your child is in possession of Travel Consent Document. Here is the sample:

To whom It may concern

 

Travel Consent

 

1. I,  __________
(parent name)  make oath and say that I
am the lawful Father of __________________ (child name) (Female) born on _________ in ____________, passport, number ____________, issued on _______________ in _____________;  .

 

2. ________________ (name of child) (my child) has my
consent to travel with ______________________ person bringing to the US (relation); passport # ______________, issued on _________________in _______________.

 

3. This consent is valid for travel starting on or about ___________________ and returning on or about _____________________ from and is not
limited to a specific location.

 

4. For further information I can be reached at:

 

Name of Parent 

 

Phone

 

Signed this 23^rd of August 2010

 

 

_________________

Signature

 

Subscribed and sworn to before me on ________________ at New York.

 

________________

Notary Public