Maybe Richter becomes an alcoholic and can't get the whip back until he completes his 12 step program....sadly, Richter dies in a horse accident while riding under the influence.
But seriously, what could Richter do that would punish his family like that? I like the idea, I hope they do something like that, I just don't know what it could be.
Of course, maybe, since there are no Renard ancestors, maybe he kills Maria with the whip. I don't know why maybe something to do with the 'Maria turning into a demon ending' in SotN. Killing a pure soul with the Vampire Killer probably wouldn't be good....