Board Thread:Theories Discussion/@comment-8871691-20130501032940/@comment-6192846-20130501212837

Because all KAITO character's are Marlon or Crim related characters, both families being connected via Kachess. Granted, there isn't a confirmation, but I will not be surprised if Caspar Blankenheim is related to the Marlons or the Crims. The "lover" I feel will be either a black-haired KAITO (differentiating him enough to not be related) or just not be portrayed by a Vocaloid as to keep it consistent.

Only exception I can't give an explanation to is Adam, who I don't feel is in any way related to the Crim family for obvious reasons. I feel the same about Mikulia, Margaret, and Margarita. I am not surprised if Mikulia's children with the noble branches into both Margaret and Margarita's families.