Beverly,
I don't know what truth there is to a single man raising a family, but poverty was such a problem for some during that time that it would have made it almost impossible if you didn't have family to help. From what I read, the Industrial Revolution made a lot of people jobless, with less people needed to do the same work. Also, dips in the stock market caused people in rural communities to lose their farm land and go to the city to find work--all in a time before social services existed. It was a sad situation--homeless children in the street (as many as 30,000), packed orphanages and abandoned babies. When I read about New York Foundling Hospital being a place where mothers could drop off their infants, I immediately thought of how that sort of thing is looked at today as a modern problem.
I have a tremendous respect for the children who rode the Orphan Trains. I read so many of their stories and see the same strength again and again. The same determination in the face of adversity. I can see why you'd be motivated to honor your mother through a memoir. Really--an amazing group of people.