Abraham and Mona are Bart's grandparents. Abraham is Bart's grandfather and Mona is Lisa's grandmother. Homer and Marge are Lisa's parents and Homer is Marge's husband. Bart and Lisa are Homer and Marge's children. Lisa and Maggie are Bart's sisters.

2. Abraham and Mona are Bart’s …
parents
grandparents
grandad

3. Abraham is Bart’s …
grandmother
grandfather
father

4. Mona is Lisa’s …
mother
grandmother
grandad

5. Homer and Marge are Lisa’s …
father
parents
grandparents

6. Homer is Marge’s …
father
husband
grandad

7. Marge is Homer’s …
sister
wife
mother

8. Homer is Lisa’s …
uncle
father
grandad

9. Marge is Lisa’s …
aunt
mother
grandmother

10. They are Homer and Marge’s …
granddaughter
children
grandson

11. Bart is Homer and Marge’s …
nephew
son
grandson

12. Lisa and Maggie are Homer and Marge’s …
sisters
daughters
nieces

13. Lisa and Maggie are Bart’s …
nieces
sisters
cousins

14. Bart is Lisa and Maggie’s …
cousin
brother
nephew

15. Herb is Lisa’s …
father
uncle
grandad

16. Lisa is Herb’s …
nephew
niece
daughter

17. Bart is Herb’s …
cousin
nephew
niece

18. Selma is Lisa’s …
cousin
aunt
uncle

19. Ling is Lisa’s …
niece
cousin
sister