rec1960: Bob: I checked Alexander Clark and Almira Maria Roberts out earlier on : Familysearch.org
If you run the search for "Alexander Clark, use birth date: 1820: plus or minus 5 years: and: Spouse Almira Roberts, you will get two hits:
Follow the hits and you will find them on the 1880 Census in Duane, Franklin, New York with Source information.
One place you will find that Alexander Clark & Almira in their household had two daughters: Fannier, age 25 b VT & Alzina Clark, dau: age 19 born NY. Also in household: an Orlando ROBERTS, WIDOWER...age 55, born VT Laborer, Fath: born VT & Mother b:MA.
When you print the data, ensure that you follow through about 4 times on the "Previous household & "Next House- hold, you will find more CLARK Families.
You will also find in one hit of "Alexander Clark" that he is with a Family with Head of Household: Henry H. ELKINS age 34 b:VT & his wife: Margret A ELKINS, age 28 b:NY
And: "Alexander CLARK is with them listed as "Father-in-Law" age 60m, b:VT Parents both born: VT. This is again on 1880 Census ; however, the Census Place is: Worth, Jefferson, NY and Source data is available to you.
Hope this helps you get started. I am always interested in "Alexander CLARK, as I seek mine also. Good luck.
Best. Barb Clark