| Answer | Crossword Clue |
|---|---|
| NAN | Bert's sister in books |
| NAN | Bert's twin sister, in fiction |
| NAN | Bert's sister in children's literature |
| NAN | Bert's sister in "The Bobbsey Twins" |
| ARIANA | Sister of Albus Dumbledore, in the Harry Potter books |
| SUSAN | Sister of Lucy, Edmund and Peter in the Narnia books |
| TOPSY | Title twin sister in a series of children's books by Jean and Gareth Adamson |
