In this case, it seems that my deceased mother is the nominee. The brokerage reported her account as receiving the dividends and equity sales proceeds after her...
Sorry, my mistake. It was listed as a 1099 Combined on their web page, which I mistook for a 1099C. It is not a 1099C, but a 1099-B, 1099-INT, 1099-DIV, and 109...