Is whether your girlfriend gets on with your mum.
Think about it.
The great Sun Tzu said "If a challenge offers you no gain, you must refuse it", but you can't can you, it's not your choice. ;-)
There is absolutely nothing you can gain from this situation, and its a gift that will keep giving at every family Christmas and Birthday until forever.
So here is an example of someone increasing the total sum of cobblers talked about alzheimers in the guardian
(ok, I changed the title, but I was very very angry about what someone wrote on the internet. ;-)
So this guy, (MA in zoology, career as a political journalist, http://en.wikipedia.org/wiki/George_Monbiot) read an article in the new scientist reviewing a paper indicating a metabolic connection between AD, and he comes to this conclusion...
"Alzheimer's disease could be another catastrophic impact of the junk food industry" *
"We cannot yet state unequivocally that poor diet is a leading cause of Alzheimer's disease, though we can say that the evidence is strong and growing. But if ever there was a case for the precautionary principle, here it is." *
* (quotes taken out of context, in order to make it looks as damning as possible)