A hacker would see this, spit on the floor, and ask 'where is the maiden name', he has no use for mums with first names. It's only the stupid people who don't the difference between a first name and maiden name that choose to simply put down the first name and fugged bout it. And you're not one of those, are you now, Ayyam?
I agree with Jimmy here, no site asks for mothers first name, just maiden name, otherwise millions of people would have the same security answer of "Sue' or "Jane' or whatever