Following the banker saying that daddies never do very well today, I investigated. Here's how each mummy and daddy (that we know of) did:

There's never been much mention of mummies throughout the show, so there's only a few I know of:

Mummies
Aileen: £8,000
Norma: £26,000
Fran: £28,000
Madeleine: £1
Maggie: £500
Jenny: £26,000
Jennifer: £32,000
Julie: £75,000
Kay: £1,313
Jean: £500
Philomena: £250

On average: £17,500

Daddies
John M: £14,000
JT: £39,000
James: £500
Dave W: £18,000
Tom: £33,000
Jason: £300
Scott: £5
Mark W: £30,000
Connell: 1p
Giorgio: 1p
Ottis: £7,000
David W: £25,000
Peter: £500
Ian: £20,000
Wrighty: £32,000
Conor: £10,000
Craig: £10
Tim: £5,000
Daniel: £24,500
Dennis: 50p
Gus: £42,047.48
Nigel: £13,000
Jamie: £28,000

On average: £15,071

EDIT: The averages have dropped, and are now under the avergae of the entire game. Still, not drastic stats.

How do you know Fran was a mummy? I thought Madeleine was the first.

Oh, and Tim (£5,000) and David W (£25,000) were daddies as well.

I recall hearing that John M was a daddy too, and he won £14k.

Wow, I had no idea Tom and Ottis were daddies!

Craig and Conor were joint daddies, too.

In Tom's game, Tom said "Mum!" To Fran, and in reply she said "Yes Dad?".

I seem to recall Ottis being a daddy for some reason. I think I'm right.

I will update the stats, thanks for your help.

Connell says in the book that he was a daddy. And also wasn't £300 Jason one as well?

That must lower the average winnings a bit

Aileen was a 'mummy' apparently

i thought Norma was the first

I think Giorgio was a daddy as well.

Fran won £28,000, by the way.

Steph has said that while she was there, £10,004 Sandra was a mummy.

Daniel was a daddy: £24,500.

Welsh Peter who won £500 was also a daddy IIRC. The position is fast becoming less attractive....

I think Nev was a daddy. When Ottis was walking over to him in a sweep, he said "the daddy."