«A Family Affair» by Mary Campisi

When Christine Blacksworth's larger-than-life father is killed on an icy road in Magdalena, New York, a hundred miles from the 'getaway' cabin he visited every month, she discovers a secret that threatens everything she's always held to be true. Her father has another family which includes a mistress and a daughter.

Determined to uncover the truth behind her father's secret life, Christine heads to Magdalena, prepared to hate the people who have caused her to question everything she thought she knew about her father. But what she finds is a woman who understands her, a half sister who cherishes her, and a man who could love her if she'll let him. The longer she's around them, the more she questions which family is the real one. . .

Truth in Lies Series:

Book One: A Family Affair
Book Two: A Family Affair: Spring
Book Three: A Family Affair: Summer
Book Four: A Family Affair: Fall
Book Five: A Family Affair: Christmas, a novella
Book Six: A Family Affair: Winter
Book Seven: A Family Affair: The Promise
Book Eight: A Family Affair: The Secret
Book Nine: A Family Affair: The Wish
Book Ten: A Family Affair: The Gift
Book Eleven: A Family Affair: The Weddings, a novella
Book Twelve: A Family Affair: The Cabin, a novella
Book Thirteen: A Family Affair: The Return
Book Fourteen: A Family Affair: The Choice
Book Fifteen: A Family Affair: The Proposal
Book Sixteen: A Family Affair: Bonus Scenes
Book Seventeen: A Family Affair: The Homecoming