Family fortune scenario

There is another thing that I noticed. I got to the second part of the scenario and one of the challenges is to get a significant other for all of the siblings. I did it for one of them, the box showed 1/3. I decided to travel to a different lot to meet more people, and the box automaticly ticked off, even though only one of them had a significant other. So maybe traveling makes it bug? The first try I didn't travel, but I moved them to a different house early in the game. So maybe that is the problem? Stay on the same lot during this scenario. I don't know if that's the answer, but seems probable.