The first Sunday in August is National Sisters Day! This special day is dedicated to recognizing the immense bond between sisters. The best way to spend the day is with your sister(s), but if that’s not possible, don’t forget to call! Whether you have a sister or not, you can also celebrate by reading a book that shows those familial bonds. So get cozy, because here’s some great sisterly suggestions.

But Not Forever by Jan Von Schleh
Sonnet McKay has a complicated relationship with her sister. It’s not that they don’t love each other—it’s just that Sonnet is always overlooked and forgotten, forever in the shadow of her stunning sister. But when Sonnet and an identical girl named Emma Sweetwine are switched in time, that relationship is about to get a whole lot more complicated.

The Absence of Evelyn by Jackie Townsend
After her sister Evelyn’s death, newly divorced Rhonda travels to Rome to confront Marco, the man who stole Evelyn’s heart, only to discover that he’s vanished in the wake of Evelyn’s death. Even after death, her sister compels her forward, and soon secrets are exposed and lives unraveled, telling a story about love in all its incarnations.

The Rules of Half by Jenna Patrick
Once a happily married, successful veterinarian, Will Fletcher now lives with his sister, learning to cope with his severe bipolar disorder. When Regan shows up at their door claiming to be his daughter, they’re forced to raise her together, turning siblings into co-parents. This compelling novel explores what it means to be an atypical family in a small town.

The Undertaking of Tess by Lesley Kagen
After their father’s death, Birdie refuses to believe he is really gone. Her older sister, Tessie, has always watched over the ethereal Birdie, and now she needs to make sure Birdie comes to terms with the death before their Mom finds out. Tessie fears that their mom may send Birdie to the insane asylum if she catches wind of how “weird” she’s getting.

The House of Bradbury by Nicole Meier
After her life has fallen to pieces, Mia Gladwell crashes at her sister’s house. When she buys the old Bradbury estate, she feels a debt to her sister, and agrees to take in a pill-popping young actress as a tenant. Under her sisters watchful (and judgmental) eye, Mia gets wrapped up in the mystery surrounding the sketches that keep appearing at her door.