Her Cowboy Daddy (Texas Legacies: The McCabes #4)
Cathy Gillen Thacker

Cady desperately wants a baby of her own.
But before she adopts, she's practicing for motherhood by babysitting her sister's rambunctious brood for two weeks. The cowboy she's always been sweet on is just along for the rideafter Cady bets him he can't last a week!
It turns out Jeb's a natural at parenting, and Cady badly needs his help. The question is: Does playing house make Jeb yearn for the real thing? He is a McCabe, after alland the name is synonymous with family!