The Shopkeeper (Men of the West #6)
Marianne Spitzer, Carolyn Leggo

When a telegram reached him asking him to come home because both his parents were seriously ill, and he needed to care for the ranch and his eleven-year-old brother, he headed home.
Aaron thought he could stay a while and get back to bounty hunting, but when his father died, he found he needed to stay. He also needed a wife to help his mother. A mail-order wife of convenience was his best option.
Delia Rusan enjoyed being her niece’s nanny until she was no longer needed. When she learned her brother-in-law could force her to work for a reprehensible man, she ran. One letter from Aaron had told her all she needed to know, and she’d marry him regardless of whether it was only a marriage of convenience.
Can two people who never planned on marriage find love and happiness?
This is a sweet romance.