Hi Carole! In this case, the connection is most likely going to happen closer to the current time, so it will be useful to find the marriages and descendants of the children.
The moment that you are waiting for, and you can never predict exactly when it is going to happen, is when you don't have to make a profile for a family member BECAUSE HE OR SHE IS ALREADY IN THE TREE. If that profile is already connected, and we can connect this family, then the goal of being connected is accomplished.