The Warfield Bride

Summary from the Vintage Classics Edition:

Penn Warfield is the keeper of a remote lifesaving station on Hatteras Island, staffed by his four younger brothers, who follow his orders, always! Naturally enough, Penn takes it on himself to select a wife for his brother Adam. It's soon clear that the chosen bride won't be marrying Adam. But she might find another match among the Warfields. The Warfield Bride won a Maggie Award as best historical romance of the year in 1994.