Someone needs to review the paperwork in detail. It *sounds* like the spouse is not entitled to anything. So the question would be who the heirs are, since there was no Will. The Wife would not take, based on the agreement. Did your brother have children? If not, are your parents alive? If not, then the siblings would appear to be the heirs. I believe that this is a complicated enough situation that you really should invest in an hour or two of attorney time.
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You would need to provide more information and documents to get an answer. As Attorney Frederick's response demonstrates, what you have provided raises more questions than answers. You should gather the information and make an appointment with a probate attorney.
As the others mention this is a "likely no", but
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