The Faraday Girls by Monica McInerney

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As a child, Maggie Faraday grew up in a lively, unconventional household with her young mother, four very different aunts, and eccentric grandfather. With her mother often away, her aunts took turns looking after her-until, just weeks before Maggie's sixth birthday, a shocking event changed everything.
Twenty years later, Maggie is living alone in New York City when she receives a surprise visit from her grandfather Leo, who brings a revelation and a proposition: He's preparing a special gift for his daughters and needs Maggie's help. When the Faradays gather from all parts of the world to celebrate Christmas in July-a longstanding tradition-Maggie uncovers unexpected family history and learns that the women she thought she knew so intimately all have something to hide.