So, why didn't Dolly Parton have children? Because she chose to be a godmother to the world. She chose to build libraries, write songs for sad people, and wear a dress that weighs more than a small car.
She doesn't have a kid to nag her to finish a song. She has a whole planet of us. Honestly, given her schedule, a child would have just been in the way of her next majestic rhinestone jumpsuit. And we are all better off for it.