How do I create option of duplicating fields for customer?

I have a form that I need to find out how many dependents someone has and their names, dob, and relation. If I make a field for name, dob, and relation is there a way that the customer can check a box or something to add more of these fields if they have more than 1?

See attached example.

Yes, that's possible and your options are:

1). Duplicate the fields multiple times and use the show and hide condition so that when checkbox is ticked, it will show another set of fields.

Guide: https://www.jotform.com/help/316-how-to-show-or-hide-fields-base-on-users-answer

2). One simpler way of capturing multiple information is by using the configurable list widget https://www.jotform.com/help/282-how-to-set-up-the-configurable-list-widget

Let us know if you have any questions or if you need further assistance.