How Well Do You Know Your Sister? 40 Quiz Questions

Forty "how well do you know your sister" questions, split into three tiers. Use it for a birthday, a hen do icebreaker, or just because you've run out of things to say on the drive home from your parents' house.

Why does a sister quiz need its own question set?

Sister relationships carry a specific texture — shared wardrobes, competing for the same mirror, being lumped together by relatives who can't tell you apart in old photos. A generic sibling quiz misses that. These questions are built for it.

Tier 1 — Facts anyone should know (14)

1. What's her middle name?
2. What year were you closer in age difference terms — were you ever mistaken for twins?
3. What was her first job?
4. What's her go-to hangover cure?
5. What was the one item of clothing she wore into the ground?
6. What's her actual shoe size (not the size she claims)?
7. What was her university or college, if she went?
8. What's her longest-held phone number's area code?
9. What was the nickname only family used for her?
10. What's her coffee order, exactly?
11. What was the first concert she went to?
12. What's her star sign — and does she actually believe in it?
13. Who was her childhood best friend?
14. What's the one food she won't eat, no matter what?

Tier 2 — The sister-specific stuff (13)

15. Whose clothes did she borrow most without asking — yours, or someone else's?
16. What's the beauty product she swears by?
17. Who got ready faster before nights out — her or you?
18. What was her signature going-out outfit at 19?
19. What's the one thing she copied from you (she'll deny it)?
20. What's the thing you copied from her?
21. Who was the "responsible one" growing up?
22. What's her current relationship status, in one sentence she'd approve of?
23. What's the wedding or hen do detail she's still talking about?
24. What's her go-to excuse for being late?
25. Who does she call first with good news?
26. What's the one beauty rule she's tried to enforce on you?
27. What's the item she'd grab first in a house fire (after people and pets)?

Tier 3 — The honest round (13)

28. What's something she's never told your parents?
29. What's the argument between you two that's never fully resolved?
30. What does she actually think of your partner (or your ex)?
31. What's a compliment you've never said to her face?
32. What's the childhood moment she's still slightly bitter about?
33. Who does she think is the better cook?
34. What's the thing about your family she'd change if she could?
35. What's a secret she's kept for you?
36. What's a secret you've kept for her?
37. What does she think you're better at than her?
38. What does she think she's better at than you?
39. What's the version of her life story she'd tell a stranger?
40. What's one thing she wants you to know but has never said?

How do you actually run it?

Print the questions, hand her half to answer about herself and half to answer about you. Compare answers out loud — one point per match. Whoever gets the highest score picks where you're having dinner next.

For sisters who live apart, a shared document works just as well: fill in separately, reveal on a call. Keep Tier 3 for when you're both actually in the mood for it — it doesn't land well rushed.

Personalise it with real messages

If you and your sister (or the whole family) have a WhatsApp group, upload the export to WhatsQuiz and it will pull real questions from years of actual messages — who forgot whose birthday, who sent the most voice notes, who's been left on read the longest. See the general how-well-do-you-know-me hub for other formats, or the sibling-focused version if you want the whole family included.

What should I read next?

• "How well do you know me" questions for siblings — the whole-family version.
• Questions to ask your siblings — the conversational, non-quiz version.
• How well do you know your brother? Quiz questions — the equivalent for brothers.