If you are still looking for information on Alexander, Harriet, Delbert & Albert Watson, here is what I have found:

The 1895 State census shows only Alexander & Harriet living in the extreme west part (Sinn Township) of Wichita County.

The 1910 Federal census shows them in Washington, Cedar County, Missouri with Alex (48), Harriet (42), Albert (9) and Delbert (7).

The 1920 Federal census shows them in Burlington, Kit Carson County, Colorado with Alex (57), Harriet (52), Albert (19) and Delbert (17).

Delbert Watson (b 3-25-1903) died 11-1982 at Larned, Pawnee County, Kansas.

Albert Watson (b 2-28-1901) died 6-1986 at Fort Morgan, Morgan County, Colorado.

You may have this information since it was all obtained thru Ancestry.com.