A new category showed up on the book listing for Courtney's books: 'Children's Death And Dying Books'. From this, we can assume that one of Courtney's parents have died, and the other one got remarried. This is kinda similar to Josefina's story, but Josefina's dad didn't marry Tia Dolores until the end of the series.
This will make for a good story, but rest in peace to my dreams of having more than one character with divorced parents in the AG canon... hopefully a GOTY someday.