You can view my blog here :
https://www.funpianolessons.co.uk/single-post/2017/11/17/Top-3-Your-very-first-piano-book-for-young-beginners-
7 years old up
1. Bastien Piano for the Young Beginner: Primer A
http://amzn.to/2AEmvm9
& Theory And Technique For The Young Beginner Primer A
http://amzn.to/2BPFeLv
or Theory Made Easy for Little Children, Level 1
http://amzn.to/2BGUwkR
If your lesson is one hour long you can add
John Thompson’s Easiest Piano Course – Part 1
http://amzn.to/2BK4Et4
Under 6 year old
2.My First Piano Adventure for the young beginner (with CD)
http://amzn.to/2AED2Xk
& Music Theory for Young Children
http://amzn.to/2BQZLPU
6 years old up
3.All-In-One Piano Lessons Book A
http://amzn.to/2BTDalU
& Chesters Easiest Piano Course Book 1
http://amzn.to/2AYc1Aw