Mediation is a process. As long as two or more people are willing to sit down and discuss important issues then mediation is possible.
It is important to disclose all issue, problems and concerns so that the process or working out a solution that all parties are comfortable with is possible.
What started out a a problem, issue or list of problems actually becomes the topic of detailed discussion and results in a settlement that all parties can live with.
Jeffrey M. Bloom, Mediator