Report join should display info from Primary & Secondary table

Summary

Report join should display info from Primary & Secondary table

Content

I have contact table with primary employment detail and custom object secondary employment details. 

Relationship contact(c_id) -> CO$SecEmp(ContactID)

For example  a member contains 2 secondary employment details. 

When I make a join  report shows 2 records but, I want to show 3 records (1 for primary and 2 for secondary)

Example

ContactID    Branch           Employer
1                 PriBranch1      PriEmployer1
1                 SecBranch1    SecEmployer1
1                 SecBranch2    SecEmployer2

How to do this in report?