Actually, at a certain level, it was a success; they've become aware that they have nothing against each other, just against their grandfathers' interference.
At a certain level, they actually like each other now.
That's a major step forward, yes?
And as a result of Ms. Yuri's plan, yes?
It's just that it isn't what Ms. Yuri intended as the results, so none of the instigators recognize that it occured.
I guess none of them have worked in client relations; "It's not a bug, it's a feature!"
Then again, normally when client relations types make that claim, it isn't true.