Duplicate field from front-end

ad adhynagara2 24 Apr, 2015
I want to collect data of user's sibling(s).
Since we can't determine the number of the sibling(s), we can't set the number of the data field as well.
I imagine to have a button that can be clicked by the user to add a duplicated field according to the number of his/her sibling(s).
Does anyone know how to do this? Thank you...
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