Hello Family!
I find it amazing to have finally found a connection to this side of my family. Rosa Colo would be my g-g-grandmother! I was going through the William and Rose Brown family bible yesterday to get some names to try again with and FINALLY had this great fortune! My mother was Helen Ward MacDonald, her mother was Jane Norton Ward, her mother was Ellen Brown Norton and her mother was Rosa Colo Brown. I believe you have her name down as "Nell" and possibly that was her nickname.
I know many of the same basic facts as you do. I also have family pictures, none of William but one of Rosa as an older woman, one of Thomas (who I believed died at an early age) and one of a sister who had suffered from a physical handicap. I also know that William was a brickmaker. There is a book online which references him regarding YOUR g-grandmother's marriage to Luke O'Toole. (Isn't this the Luke written about in "Studs Lonnigan"?).
I'm looking forward to further communication about our family with all those who are interested!
Jane