Wishing for a Cowboy (Wishing River #3)
Victoria James

Aiden Rivers can’t dispute this is his kid when he sees his own features staring back at him, but he had no idea Janie’s sister was pregnant when she left him. He didn’t even know she had a sister—clearly they’d all been lied to. Now he has fifteen years of fatherhood to make up for and no idea how to be a dad. This was never in his plans.
Janie sticks around to help him ease into parenting, everything from showing him how to lure a sulky kid out of his bedroom to keeping up with the latest teen-speak. Together, they surprisingly make a good team, this city girl and country boy. But when the past catches up with them, Aiden and Janie must decide what’s best for the boy who's connecting them, not only for each other…which could mean splitting them apart.