Inter se

Inter se is a Legal Latin phrase meaning "between or amongst themselves". For example:"The constitutional documents of a company constitute a contract between the company and its shareholders, and between the shareholders inter se."In Australian constitutional law, it refers to matters concerning a dispute between the Commonwealth and one or more of the States concerning the extents of their respective powers.
See more at Wikipedia.org...

Inter se - as between or amongst themselves. As between the parties. - (read more on Inter se)
  

Amongst themselves