Books like Sister, sister by Andrew Neiderman

A lighthearted story of a young sister's journey through boarding school.

Lady Ruth Penderric, trapped in a decaying castle with her miserly brother and selfish sister, is rescued from a ransom kidnapping by the gallant Oliver Pardoe, a banker's son. His help brings her to London, where a promising courtship with a lord unfolds, yet Ruth’s heart is already captured by Oliver’s steadfast courage.

After her best friend Charlie dies, Grace discovers unsettling secrets, a possible sister, and a chilling threat that may endanger her and those she loves.

Marty and Melissa, two sisters with opposite tastes, must share a room and discover that living so close—though frustrating—brings them closer together than they thought.

When Violet Colby meets her long‑hidden identical twin, the reunion sparks an unexpected romance with businessman Landon Derringer.

When her younger sister advances a grade and becomes instantly popular, Sammi must overcome jealousy to protect her sibling from a hostile school clique.

Nancy and her accident-prone pen pal Ally finally meet and find their friendship feels just like siblings.

Two conjoined sisters of mixed divine and human heritage grapple with divergent destinies when one gains magic and the other none; a missing father forces the mortal Makeda to discover her own powers and reunite with Abby in a gritty, magical urban world.

Twin sisters Lia and Alice Milthorpe become orphans and enemies, drawn into an ancient prophecy that pits one good and one evil. Their search for truth leads through mysterious marks, secrets of their parents’ deaths, and an unexpected boy.

When grown‑ups fail them, fifteen‑year‑old Cart and eleven‑year‑old Lucy must decide whether to face family abuse or risk a dangerous escape, all while fighting the threat of being separated.

Carla Santini. She's the Italian exchange student who's coming to stay with Jamie Hogan and her family. Jamie can hardly wait to spend time with Carla--it will be just like having a sister her own age. But Jamie has a lot to do before Carla arrives. There are rooms to organize and sleeping arrangements to decide. There are friends to tell the big news to, and four months of activities to schedule. And Jamie has her boyfriend, Andy, to think about. She wants to include him in all of the plans. Jamie spends hours imagining what Carla will be like. When Jamie finally sees her guest, why can't she believe her eyes?

Carlo navigates the challenges of loving his mentally handicapped sister, learning acceptance and empathy along the way.

Eighteen‑year‑old Molly seeks independence from a controlling mother by chasing romantic ideals, while her sixteen‑year‑old sister Shera becomes unexpectedly pregnant, setting off a family drama of love and self‑discovery.

Jessica and Elizabeth Wakefield are so different, it's sometimes hard to believe they're twins--until the day they discover that they can read each other's minds.

Jenna, a mountain‑raised warrior, learns ancient magic from the mountain women and summons her dark twin from a mirrored realm of light and shadow.

A tense, award‑winning drama about two maid sisters whose 1930s French crime conviction forces them to confront family, class, and forbidden desire in a small household.

An orphan searches for her twin sister, but can't find the family she's been longing for.

A sister watches her twin brother’s life‑sized image float across a TV screen, realizing he is a wanted arson suspect involved in the fire that killed their parents.

After the disappearance of their cousin Audrey, the Wildling sisters spend a summer at Applecote Manor that turns into a mystery of secrets, family drama and a dangerous choice that threatens their bond.

Five successful women star in a New York reality show called Goal Diggers, where ambition, rivalry, and a shocking murder threaten to unveil deep family secrets and betrayals.

"From behind the wheel of her car, Tess Kincaid glimpses a woman walking down a Madison, Wisconsin, street. They've never met, but Tess senses an undeniable familiarity about her. Hair color, square chin, wide-set blue eyes... Tess sees the same features every time she looks in the mirror. Intrigued, Tess introduces herself and discovers that she and her doppelganger, Mimi, have more than appearance in common. They even share the same birthday. Mimi--confident and outgoing where Tess is understated and shy--is convinced they're twins, separated shortly after birth. Tess, who's felt unloved and unmoored since her mother disappeared years ago, only knows that there's more than coincidence at play. And when a body is discovered in a local marsh, Tess is entangled in a search for the truth that will prove fascinating, disconcerting, and ultimately terrifying..."--Cover.

In the aftermath of a global virus that mutates humans into nightmarish creatures, three women—Erin, Savannah, and Mareva—confront survival, trauma, and the forces that bind them together.