Three Reasons To Wed (The Cedar River Cowboys, Book 1) by Helen Lacey
Why Daddy should marry
In Cedar River, Grady Parker is the town's most eligible bachelor. But on his ranch, he's just 'Daddy'. His three little daughters are all the females he needs...until Marissa Ellis moves in next door. Grady and his late wife's best friend never agree on anything - but attraction!
Marissa fulfils her promise to love her goddaughters, but their sexy father is offlimits. She can't - won't - step into her best friend's shoes and into her husband's bed, no matter how tempting he is or how cosy his family. But three darling little girls can be awfully persuasive...