Did both of your parents die in Wisconsin?
Has your brother never mentioned anything about what happened to the will?
His sending the payment to beneficiaries from his personal account is highly irregular and suspicious--there should have been an estate account opened up if in fact he opened up probate, which it appears that he didn't. Probably giving beneficiaries some "chump change" out of guilt for the greater amount he may have misappropriated. Conniving indeed--to the max!!!!
With a little bit of investigating on your own or with the assistance of a Wisconsin probate attorney or private investigator, you will most likely be able to uncover his misdeeds and force him to pay up or face legal consequences for his actions.
Please consult with a Wisconsin probate attorney (who practices in the same town or county where your father died) to decide if it would be to your advantage to open up probate yourself (or your attorney would open it up on your behalf), which would then give you or your attorney the legal authority to contact banks, insurance companies, and any other asset holders to get information about your father's bank accounts, retirement accounts, etc. and also order copies of your father's state and federal tax returns for at least the last 2 years he was alive to get other clues about his financial matters.
Go online to check the county courthouse probate records (for whatever county in Wisconsin that the deaths occurred in) and land records, searching by using your father's name to see what results may come up and your brother's name, to see if there were any court cases or land ownership involving his name.
I sure hope that your brother did not get your father to issue your brother a signed power of attorney that would have given your brother to handle your father's financial matters. If a power of attorney was granted, he could have used that fraudulently to have your brother's name added to your father's bank account or to change beneficiary designations on your father's life insurance policies to pay your brother only (which is illegal if he did that in fact). If you or your attorney discover that this has happened, you will have to decide whether you wish to charge him with breach of fiduciary duty or abuse of power of attorney or theft/misappropriation of assets (with the way he mishandled his father's assets--if he never filed to open up probate, then he had no legal authority to distribute any of your father's assets because he never received paperwork from the court to authorize him to act as executor).
I sure hope brother has some of his assets in savings or squirreled away, because if you all can prove what he has done, he will have to turn over some of that money to you!