You cannot get a pro bono probate attorney in these circumstances. You need to at least consult with a probate attorney in your area, to find out if you can even do anything at all.
R. Jason de Groot, Esq., 386-337-8239
I can't imagine you will get a pro bono attorney for this. You may get one who will take it on a contingency fee, if it looked like you were going to get any assets. You state you don't believe the will is legit, but then you tell us she has not filed a will. If there is no will you could attempt to begin the probate of this estate as one without a will. I suggest you consult with an attorney in your area.
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I agree with the other attorneys. This is not the type of case that is handled pro bono. You need to consult with an attorney who practices in the field of probate. For your information, pursuant to F.S. Section 732.901 Production of Wills, the custodian of a will must deposit the will with the clerk of court having venue of the estate of the decedent within 10 days after receiving information that the testator is dead.