The chances of it being her mum are zero.
Hang on a moment. Are you suggesting all the mom/daughter porn I've seen isn't real? Actresses, you say? Well bugger me. All my illusions shattered. You'll be telling me news stories in the tabloids are made up, next.
Of course you're right, threechilliman. Some guys are so gullible it's untrue!
I'm going to write to the Daily Mail about this advert....