I think you have to fill out 4, one for each person.


I would suppose, fill out 3.6 with thruthful but possibly vague answers.
I have no idea why they want this information anyway.

A few visa sites advice on 3.6

3.6 Major family members – people who live with you or first degree relatives (parents, siblings,
offspring)

Major family members:You and your spouse, children where applicable. Just put those immediate family members you live with. If you live alone, put the name of at least one living relative (preferably immediate family - child, parent, sibling).