Good morning. If named on the insurance policies, as the designated beneficiary, you will receive those proceeds. But, with regard to everything else, unfortunately you will not due to the decedent dying intestate. Intestate succession rules follow related party lines and since there is no blood relation in any respect, as a brother in law, you would unfortunately not be in the line of parties to inherit any part of the remaining estate. I'm sorry!
Checks delivered prior to death can be cashed, but if they are simply signed and not completed, you would not legally be entitled to complete them now. I'm not saying that if you pre-dated them that somehow you wouldn't be able to get them cashed, but it's not something that you should do. If the brother in law owed you money, the better route is to make a claim against the estate.
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