They all lived in a house on Ararat Avenue in South West London, as mentioned on the 1924 book.
The styling changed in the early years from very skinny and stick-like bodies to the more familiar rounded figures as seen by 1924.
An early-introduced character was an elderly gentleman, Mr Cheery, who helped Japhet when he was lost in an early story.
His adopted son, Tim Tosset featured in the earlier strips but had left by the time Happy was introduced in c1926-27.
Also see Panjandrum for a later use of this Samuel Foote invented word, probably influenced by its popularised pre-War usage in the Japhet and Happy strips.
The first book published containing their stories was the 1920 Cassell & Co small format hardback Some Adventures of the Noah Family including Japhet.
In style they became reprinted cartoon strips with songsheets at the end, having dropped the longer stories.
After the war from 1946 to circa 1951 they continued as undated annuals, mostly in the smaller landscape style, but with two in a larger format in similar size to the 1924 one.