I found the profiles you created for William, his wife, Mabel, and their son, Cecil. I adopted Mabel and added sources to her (her parents names, her marriage date, her death), but I don't understand why you aren't the profile manager of those profiles you created? I found William, Mabel, and their children in 1900 and 1910. Mabel died in 1927 as a widow. I found her in 1920 living with sons Roland and Cedrick (THERE'S an English name for you!) Did you know that Mabel's parents are both buried in the same cemetery in the same plot in Mobile, Alabama as William Frederick? There's a story there, I'm thinking. All three have Find A Grave memorials with headstone photos. I found all this information using Family Search for Mabel's death and marriage info, the death record gave me her parent's names so I could find her in census records. As you are directly related to William Demont Frederick, and I have found his exact date and place of death, you should be able to send away for his death certificate, which may yield more clues to his life: maybe where he was born in New York so you can find him living with his parents in census records, maybe the maiden name of his mother, where for sure his parents were born, who gave the information for his death certificate, whether he was listed as married, single, widowed, or divorced at the time of his death, which could tell you if he and Mabel had split up before he died.
We tend to get stuck when we don't think outside the box. Family Search also has census records available. Some of them that aren't on their website give links to other websites where the images are viewable. ALWAYS LOOK AT THE IMAGES! I cannot stress this enough. You'd be surprised at what you can learn just by looking at the actual image. I haven't looked to see if there were any other Fredericks living in Toledo at the time of Mabel and William's marriage, but there might well be. Why did he move from New York to Ohio? Was it his line of work? Did he have family there? Perhaps a sibling moved to Ohio and he followed them there for better opportunities? These are questions to ask when researching people and trying to make sense of their lives.
I will gladly un-adopt Mabel and let you take "ownership" of her and the other members of her family for whom you've created profiles. Just let me know. :)