No Greater Love - Danielle Steel

Twenty-year-old Edwina Winfield is forced to assume the role of head of the household, becoming both mother and father to her five younger siblings after her parents and beloved fiancé drown during the disastrous sinking of the Titanic. Determined never to marry, Edwina must also run the family newspaper until her younger brothers are old enough to step in. But next-in-line Phillip heads first to Harvard and then is tragically killed during World War I. Fun-loving George is wooed by the lights of Hollywood and exquisite sister Alexis follows in his footsteps. While tending to the youngest children, Fannie and Teddy, Edwina must assist the rest of her siblings out of their many scrapes and escapades.