Showing All in the April Morning by Jean Saunders

The day dawns bright and fair on peaceful San Francisco. Outside the Pendleton mansion, the O’Connell sisters – Bridget and Kitty – enjoy the freedom of the hour. But this is the day of the great San Francisco earthquake and life is set to change forever for the O’Connell girls.
Orphaned by the disaster, Bridget must assume responsibility for herself and eight-year-old Kitty. They face an uncertain future with only Bridget’s fierce spirits to sustain them.
All in the April Morning is an epic novel of one woman’s struggle to control her own fate throughout the first half of the century, in peace and war, from the stricken west coast of America to the green horse-breeding country of Ireland. It was first published in 1990.