Child questions are the questions that get repeated as a part of a group question. Here is more about them.
There are two parts of a group question on Collect.
a. The parent question or the question that decides the number of times a group gets repeated
b. The child questions or the questions that get repeated as the part of a group
About Child Questions
Let's take an example where you want to ask the name and age for every member in a household. For this you create a group (choice) question.
In this group example, the parent question will be “How many people are in the household?” and the child questions will be “What is his/her name?”, “What is his/her age?”.
Note:
You can make child questions of any question type except another group question. Child questions have a separate option of “Rules” right next to the group. You can use it to add conditions within the group. Click here to learn more about Group questions.