Question I may have asked before...

...is there any canon information on the origin of the three sisters in Despicable Me? I know there's nothing in the film itself, or its sequel, but I'd imagine that there may be outtakes on the Blu-Ray disk I haven't see, additional books etc. related to the series, and so forth. Anyone aware of anything?

Also posted at http://ffutures.dreamwidth.org/2071079.html, where there are