Steve,
Since you are not a collector and don't have any expertise, you might do best to consign the collection to a reputable auction, of which there are many. The auction house will know which key cards need to be graded, and which cards will fit logically into group lots.
And it sounds like the family needs some immediate money upfront. That shouldn't be a problem, as virtually every auction house can provide you with a cash advance as soon as they have the cards. An advance could be in the area of 25-50% of the appraised value, but that of course needs to be negotiated.
I don't think you should try to sell it yourself, because without any knowledge of how to proceed you will make too many mistakes.
Good luck with the sale.
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