My distant cousin from Canada sent me some more information on the Downie family that he found. It includes a death record for my great-great-great-grandmother, Margaret Ogilvie (Downie) Cuthbert, and pictures of two of her brothers, William and Anthony. He also sent a picture of another Cuthbert named John, but I don't know if that's a brother or a cousin (most likely a cousin since no "John" appears in other family records).
death record for Margaret Ogilvie (Downie) Cuthbert