This may get a ittle confusing - and at some point it might be easier for me to photocopy some pages and snail to you. Email me directly if interested.
Josiah F. Dow with sons George F. is given as maybe the son of Levi Dow. Levi's father was also Levi (b. 1756) son of Judah Dow. Judah had 13 children, including a son Zaccheus (b. 1769). Zaccheus had a son Tristram (b. 1792). Tristram's son Newell (b. 1817) is the father of Alroy C. Dow.
A note of interest - after Judah and wife Mary Wilber had son Levi, the next 4 children were all given names beginning with Z - according to the author - possibly as a "token of desire" as they were a desperately poor family and each added child was a burden!
Judah's posterity is probably the largest of any 4th generation Dow.