Are you looking for something beyond a family tree for your familia unit? How about a children's book? There are LOTS of real world examples you can look at before AND it's a perfect authentic task.
Check out my last post to see which books (hello authentic resources!) I used with students before we created our own. They also had lots of practice with personality and physical descriptions during this unit.
This project was a summative assessment grade. I didn't want them using translators or AI so I gave them a paper graphic organizer for their children's books that they filled out in class, Chromebooks closed. This gave me a good idea of what they could really do with the language and it prevented me from giving them a grade based on how pretty they made their children's book. This is a language class, not a design class, so even though some students made some amazing looking books they might have only gotten a B based on their language. We are an IB school so I used an IB MYP Language Acquisition rubric but any proficiency based rubric would work for this project.