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If you can't answer all the questions then I would not go for it.
Also make sure that the deal is in writing prepared by an independent lawyer with no ties to your brothers relative. Doing business with relatives involved is not always such a good idea as the previous post suggested.
I'll take a smaller % and enough $ to cover development cost so at least if it does not work you will have covered its cost of dev.
In addition look at the possibility offered to create new portable scripts that could be sold to other clients :)