I have a bit of information on this family. Aside from the two children you mention, Amos and Hanna had three other children who died young:
Arva Johan Kujala, born 1 Jan. 1918 in Woodstock, Maine; died 10 Jan. 1919 in Sumner, Maine.
Martha Sofia Kujala, born 19 June 1919 in Sumner; died 15 Dec. 1919 in Sumner.
Agnes Johanna Kujala, born and died 29 Aug. 1924 in Jay, Maine.
Amos' wife Hanna ("Anna" in some records) was the daughter of John Jacob and Amanda Gustaava (Nuttila) Nurmesjarvi. She was born 27 Feb. 1896, and died 22 Jan. 1941 in Jay, Maine. She and Amos had married on 2 Feb. 1917 in West Paris, Maine.
All of these dates are taken from Maine vital records. I've spelled the names as they are given in the records, which are not always accurate when rendering Finnish names.
Chris Dunham