So long as Parental Access is granted in the relationship settings in Core, the Guardian or Stepparent will come over into ConnectRE, where the user can then either create a new constituent record, or link to an existing one.  However, unlike Parents and Grandparents, a relationship record will not be created between the student and their stepparent or guardian.  The user may opt to manually create a relationship record between the two, and this will not impact the ConnectRE integration.

For more information on how relationships are mapped between ON and Raiser's Edge, see Data Integration for Connect Raiser's Edge