When the girls go down for a sleep at noon she manages a couple of hours of correspondence study on top of organising the nightly meal and doing the washing and housework.
Mrs Davis said she could not afford a nanny even if she wanted one but she was not someone who needed to "keep up with the Joneses".
"There's nothing wrong with wanting to have nice things and live a nice life if you can afford it. It's all very well having a nice house but it's how you are as a family that makes that house a home."