After a discussion of the importance of relationships among objects as a first-class modeling concept in object-oriented technology, a new object-oriented programming language, named as RCPP (relational C++), is presented and developed in this paper, which can directly and explicitly support the relationships among objects. Object relationships can be used to dynamically manipulate object behaviors and their propagation. In this paper, the authors explain the functional properties, the language model for the specification of object relations and its implementation mechanism, especially the semantic aspects of object relations. The running of RCPP programs is implemented first by translating RCPP source codes into C++ codes, and then by compiling and linking them to form executable programs.