No, there weren't 2 Hatties and Asas. I showed them based on a descendancy chart, and since they have a common ancestor, and since I gave the spouse names, they each ended up being listed in 2 places in the chart. Each is listed once under name of parents.
As for the Pattersons, Hattie is the child of Nathan - but I don't know if their is a "Patterson connection" between them and Archie. There are a number of Dow-Patterson marriages listed in the book. Belle's sister Irene m. John Patterson. There is also a mention of Ann J Dow who m. Archibald Patterson. Ann J is listed as dau. of David Dow and Doletta Dow. Doletta is a sister of Belle. Ernest Dow m. Ella M. Patterson - etc. Not only are there a lot of relationships between those two surnames, but another in the line m. Annie F. Cummings. It's all quite convoluted :-)