The Crossley Baby by Jacqueline Carey

Bridget, Jean, and Sunny Crossley grow up in modest circumstances on Long Island, and all end up in the New York City of the 1980s. Free spirit Bridget, the oldest, is a well-traveled, sometime massage therapist in the East Village. Outspoken Jean is a corporate headhunter in double-breasted power suits who lives in a gleaming Upper East Side tower. Harvard-educated Sunny, the youngest and sweetest sister, drifts from eligible boyfriend to eligible boyfriend until she falls for a Harlem real estate developer and starts a family.
When Bridget dies unexpectedly during what should have been a routine operation, she leaves behind a ten-month-old girl named Jade. The big question becomes: Who should take the baby? The obvious and expert Sunny, or the never-at-home career woman Jean? The answer is, of course, more complicated than either sister could have anticipated.

“From the Trade Paperback edition.”