An Oscar Samuel Dow was b. 28 May 1862; m. 30 June 1879 Augusta A. Young. He is listed in "The Book of Dow" as probably the same person as the book has named Samuel O. Dow - and who m. Grace M. Wood.If that is the case, then he had no children by Augusta, and by Grace (she b. Pepperell MA 1870) he had Arthur Warren b. Hopkinton 1893, Ernest Clyde b. Hopkinton 26 Aug 1895, Marion Emma b. 30 Oct 1902, and Lillian Lucy b. Concord 11 Oct 1905.
If you think these might be the ones you are looking for, please email me directly and I will be glad to provide more details.