thanks again! I've been looking, albeit off and on, for over 10 years to find Platt's ancestry and check in with ancestry and genforum from time to time. It was just a month or so ago that I finally found the will for Platt's possible grandfather. Today, I thought I'd look again and through a google search found WikiTree.
The one family I've not tracked down in any depth is a Joseph Mott family living in Delavan, Walworth, WI in 1870 who come from NY. He's 70 and they live 2 houses away from a Nichols family, which is also allied with my direct lines. Delavan isn't too far from Rock Island, IL ....
The hunt continues :) Again, thanks so much!