Yes you can. When a sim enters college, their household will still be playable. You will need to play as your college student to have them progress however.
I downloaded it off a German site, but the program looked rather old and I had difficulty using it, even with advice. Does anyone know what the best version is?
I would create a new sim for Brandi to be involved with, considering I don't think they are any real suitable matches in the neighbourhood that I'm aware of. Darren Dreamer also in my mind belongs with Cassandra.