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For Him / Her / Kids
Knock Knock What I Love About You, Sis — a little book you fill in for your sister
Knock Knock What I Love about You, Sis Fill in the Love Book
Reviewed by the WhyToBuyThis team · Updated September 2026 · How we choose
Perfect for
- Sentimental sisters
- Big, little or middle sister
- Tucking in with a bigger gift
- Under $15
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Price: $10.00
Price may change on Amazon. As an Amazon Associate we earn from qualifying purchases. This won't cost you anything extra.
- Great gift ideaChosen for real-world gifting
- Hand-pickedCurated, not scraped
- Honest reviewThe catch, not just the hype
Why this gift works
What I Love about You, Sis is a Knock Knock Fill in the Love book: 112 small pages of fill-in-the-blank lines, each describing some aspect of sisterly love. You finish every line - as sappy, sassy or silly as you like - and give it to her. It is a 4.5 by 3.25 inch hardcover with a removable clear jacket, first published in 2015 and distributed by Hachette.
A store-bought card gets read once; this gets kept, because every line is in your words. Knock Knock markets it for a big, little or middle sister, and it is small enough to tuck in with a bigger gift.
Who is this gift for?
Great for
- A sister's birthday
- A sister who has moved away
- Tucking in with a bigger gift
Think twice if
- You will not have time to fill it in
- She prefers practical gifts
The catch
It only works if you put in the time to fill it in, the pages are tiny so each answer gets a short line, and it is the same format as Knock Knock's general What I Love About You book.
Skip if you will not have time to write in it before you give it.
Key specs
| Pages | 112 |
|---|---|
| Size | 4.5 x 3.25 in |
| Binding | Hardcover, removable clear jacket |
| Format | Fill-in-the-blank |
| On sale | June 1, 2015 |
| ISBN | 1601067593 / 9781601067593 |
Worth knowing before you buy
- It is part of Knock Knock's Fill in the Love series.
- It has a removable clear plastic jacket.
Why we like it
- Personal without being hard to write
- Small enough to carry
- Hardcover keepsake
- Inexpensive
What to look for in a fill-in gift book
- Prompts. Short prompts are easier to finish; longer ones say more.
- Size. Small books tuck into a bigger gift.
- Tone. Pick one that matches how you two talk.
Questions people ask
4.5 x 3.25 inches, 112 pages.
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