Irish Hearts by Nora Robertsby Nora Roberts

Irish Thoroughbred
 It was a dream come true for Irish lass Adelia Cunnane -- to work with her uncle, a horse trainer at Royal Meadows, one of the most renowned stables in the world. But there was a catch, and his name was Travis Grant. He was the stable's owner, and a man as proud, as passionate, as opinionated as . . . herself.

The heroine of Sugar Daddy, Liberty Jones, works for the billionaire Churchill Travis, who has broken his leg in a riding accident.  The oldest Travis son, Gage, has made it clear that Liberty and the eight year-old sister she is raising by herself are not welcome at the family mansion...