Mary Ann Ashley was called Molly on the 1900 census. The names of the children I know about were Clara B., Flora Lee, Willis M., and Erma O. There may have been other children as well.
The census almost never states who a person's parents were, but in some years, does state where a person's parents were born.
It is curious that right next door to William and Mollie in 1900, was a Jane Tussey age 64, a widow. One would assume she was William's mother. Yet the census states she had not had any children, and had been born in Miss. It makes me wonder, though.