If the Robertson family is a business - oriented one, key events might include the founding of their business, major mergers or acquisitions they made. For example, if they run a manufacturing company, the day they introduced a revolutionary new product could be a key event. Also, any awards or recognitions the family business received would be part of their story. Another aspect could be if they overcame a financial crisis or a difficult business competition, those would be significant events in their family's business - related story.
Again, without knowing the exact Robertson family, it's hard to say. But generally, key events could be births, marriages, and deaths. These are important moments that shape a family's story.