Now for the family in America:
1910 census- Manhattan, N.Y. (Ancestry will have scanned image with more details):
Duncan K. Watson, 61, Scotland, to US 1905
wife Margaret Watson, 56
dau. Eva C.F. Watson, 34
son Thomas A. Waatson, 29
son Francis S. Watson, 27
dau. Anna E. Watson, 26
son Alexander E. Watson, 23
1910 census- Manhattan, N.Y.
Frank Dalton, 25, Mass., parents- England
wife Kathleen Dalton, 24, Scotland, to US 1905
son Albert J. Dalton, 2
sister-in-law Eva Watson, 33, Scotland, to US 1905
nephew William
Scott, 4, N.Y., parents- Scotland
1920 census- Manhattan, N.Y.
Frank Dalton, 34, Mass.
wife Kathleen Dalton, 33, Scotland, to US 1904
son William
Dalton, 14, N.Y. [1910- William Scott]
son Albert Dalton, 12, N.Y.
dau. Kathleen Dalton, 5, N.Y.
mother-in-law Margaret Walton, 66, to US 1904
sister-in-law Eva Watson, 44, Scotland, to US 1904
1930 census- Manhattan, N.Y.
Kathleen Dalton, 43, Scotland
son William
S. Dalton, 24 [1910- William Scott]
dau. Kathleen Dalton, 16
lodger John Gillon, 63, Scotland
It is likely the rest of the Watson family will be found in U.S. census records, the sons in WWI & possibly WWII draft registration cards, Social Security Death Index (SSDI available at
www.familysearch.org). You could also look for Francis Watson's arrival in US on Ellis islanwebsite.d