How to get the node ids of answers for a question in Drupal Services (REST)?
I didn't know what are question and answers modules that you used. My assumption is your answer and your question has a content type and they linked together. So if my assumption is correct here is the way that you can use for solving your problems:


Create a views will list all the answers of specific question(your question nid).
using Views Services to get the views that you created before and use your question (question nid) for the views parameter.


In case my assumption is wrong. Your have to create custom resource by your own to get the list of answers. In this way you must create your SQL sentences too. The reference for creating custom resource here