Acording to a certain question, i.e. number of kids in the family
Ask for each one name, age and hobbies

This has been asked many times in the forums. There is no "looping" in LimeSurvey.

You will first need to insert a question asking how many people. Then you add as many question groups as the maximum possible people and use conditions/relevance to show the groups depending on the answer to the "how many" question.

Thanks, but then, how to use conditions/relevance to do that?

Place relevance on the groups - manual.limesurvey.org/Creating_a_questio...groups_conditionally .

So, for example, the relevance for the first group would be "Q1 > 0", the second group "Q1 > 1" and so on.

Hi, carlesb,

there is a good example for that in one of the demo surveys.
Exactly the problem: "How many childs" -> How old is your 1. child? - "How old is your 2. child?"

These example surveys you find in the folder "docs/demosurveys"

Best regards
Joffm