Is Ranma bound by any agreement his father enters into?  Is family honor
that easily manipulated?  Can Genma so readily play fast and loose with
family committments and have Ranma always follow the current promise?
Wouldn't the family honor require that Ranma attempt to uphold the
agreement with the Tendos which did not specifically call for a Ranma-Akane
marriage but a Saotome-Tendo marriage?  I would think that the earlier
promise would continue to hold and would take priority and there are two
other Tendo sisters available.  And of course, if Nodoka ever found out
about Genma's latest sale of Ranma, there would soon be a nice panda skin
rug in the Saotome home since Genma really did dishonor the family name .  

                                                                          dml