Family Fortune-Heal Negative Sentiments

My sims no longer have any negative sentiments towards each other, but the scenario task will not complete. I have checked every sim's "open profile" of each of their siblings and none of them have negative sentiments and they haven't for some time now. They have good relationships with each other too, but the game will not move forward. I have been playing for hours and I am disappointed I can't finish the scenario.