I was looking through the story where Ranma gets his curse locked by the ladle and decided to look up something that hadn't sounded right to me whenever I encountered it in a fan-fic. It's the part where Soun supposedly says that Ranma will have to marry him if he isn't able to unlock his curse. But what I see is that Soun offers to arrange a marriage -- just the act itself -- and nothing more. However... That's not to say that he didn't say "arrange to marry me" in Japanese, or that the English translation failed to convey what could have suggested that that's what he had meant.
While I highly doubt that Soun would be even remotely interested in marrying Ranma (for the sake of joining the schools or not), I'd rather have a second opinion and/or a factual confirmation on what he said either way.