| Answer | Crossword Clue |
|---|---|
| LISA | A sibling of Bart's |
| NIECE | Daughter of a sibling |
| MOPSY | A sibling of Cottontail |
| NIECE | Issue of a sibling |
| FLOPSY | A sibling of Cottontail |
| CHICO | A sibling of Zeppo |
| ABEL | Victim of a sibling rivalry |
| ONCLE | Sibling of a mere or pere |
| CAIN | Biblical figure with a serious case of sibling rivalry |
