Document Library - Response & Response to Response Migration

Hi,

I am trying to migrate a doc lib.

There are 3 forms.

1. Document Form

2. Response Form

3. Response to Response Form 

 There is a relationship between Document -Response - Response to Response entry between forms. (Includes attachments in each form). 

How should I maintain the relationship in a list / Library with the same hierarchy.

Sample: Document (Have Attachments)

                    |->  Response (Have Attachments)

                          |-> Response to Response (Have Attachments)

 

If I migrate Document Form in one job and migrate another form in another job I can make only two relationship. Using SharePoint GroupBy OOTB option. 

How to achieve the above example flow in the migration

Kindly advise.