is also accessible for children - if only the dialogue sections are used, and the grammar avoided. (Grammar is always in Part A, except for the first couple of episodes.
The same goes for the recordings on Latinum.
The part B and C sections are accessible for kids - maybe not the syntax, but the simple dialogues - I have a hat? Have you got a hat? etc.
The book starts very simply.
Adler can be obtained cheaply from publicdomainreprints
There is a link on the website