I am looking for an older book I read in the 90's, it was a Harlequin Romance book, the main character was Kate who moved with her 2 young sons out to a ranch to care for the ailing father of the male lead (cant remember his name). The mail lead was half Indian and was abused as a child because of this, he also had a younger brother in the book who was in the rodeo. She was on the run from her abusive husband with her boys, and the book starts with her the kids in a diner and they are sleeping and then get picked up by the male lead character. Good luck!

"Beyond All Reason" by Judith Duncan