I recommend to start with Volume 1 of Lev Alburt's "Comprehensive Chess Course"......the book is targeted especially to young children, as a very first introduction to chess.....however, you should be the teacher....i.e. learn the lessons yourself, then work together with, and teach them to your child....
https://www.amazon.com/Comprehensive-Chess-Course-Lessons-Enlarged/dp/1889323233/ref=sr_1_1?crid=90U0OSARYBEE&keywords=comprehensive+chess+course&qid=1576181815&s=books&sprefix=comprehensive+chess%2Cstripbooks%2C202&sr=1-1
After completing Volume 1 of the Lev Alburt course, I highly recommend to next work through "Bobby Fischer Teaches Chess" with your child. Again, first learning the (very easy) lesson(s) yourself (as your go), then sit together with the child and guide them through it....I did this with my 8-year old daughter (years ago)....it's a very good first book of chess, easy and quick to work through...
https://www.chess.com/blog/RussBell/bobby-fischer-teaches-chessa-book-review
https://www.amazon.com/Bobby-Fischer-Teaches-Chess/dp/0553263153/ref=sr_1_3?crid=1DEDQMJEDSZI2&keywords=bobby+fischer+teaches+chess&qid=1576182273&s=books&sprefix=bobby+fische%2Cstripbooks%2C199&sr=1-3
you can optionally supplement the above books with the introductory "Learn Chess" by GM John Nunn.....a 7-year old will not read it, but it will help you with your chess understanding...
https://www.amazon.com/Learn-Chess-John-Nunn/dp/1901983307/ref=sr_1_1?keywords=learn+chess+john+nunn&qid=1576182527&s=books&sr=1-1
Finally, after completing the recommendations above, for follow-on instructional material, you (i.e., your child) could move on to Volume 2 of the Lev Alburt Comprehensive Chess Course, or choose to work with any of the titles I recommend for beginners in the following lists...
Beginners Chess Courses, Lessons, Instructional Resources...
https://www.chess.com/blog/RussBell/beginners-chess-course-instructional-resources
Good Chess Books for Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-books-for-beginners-and-beyond
As I've alluded, it's essential to work together with your child and guide him through the lessons. Do not expect him to work on these lessons alone, else he will very likely get discouraged quickly and abandon the effort.....it goes without saying as well that lots of positive feedback from the parent works wonders for the child's motivation....
Good luck...
I have a 7yr old that enjoys playing chess. I am not much of a player, so getting close to what I can teach him :0
I am looking for something that teaches him at his level. He can read, but would have difficulty with technical things. I have been building my skills along the way with him, but would like something that is more visual for him.
Any ideas?