A third possible theme could be love and support within the family. No matter what difficulties the family faced in 2013, the love and support among the members could be a central aspect of the story. It could show how they cared for each other, helped each other through tough times, and celebrated each other's successes.
Another theme might be change. 2013 could have been a year of significant changes for the family. It could be changes in family structure, like a new member joining or an old member leaving. Or it could be changes in their living situation, like moving to a new house or a new city. The story could be about how they adapted to these changes.