Young family member is interested in physics, which books should they read? (helpfulscience.medium.com)

"Surely You're Joking, Mr. Feynman!" by Richard Feynman.

fun demos and lecture style for younger viewers, scratching open a number of fundamental topics. w. the professor J.S. Miller

https://yt.artemislena.eu/search?q=JULIUS+SUMNER+MILLER [videoz]

How to, what if? 1+2 and thing explainer all by Randall munroe. The latter one is the only one i can recommend for younger kids, it has only 1000 different words.

The Flying Circus Of Physics https://en.m.wikipedia.org/wiki/The_Flying_Circus_of_Physics (the 'with answers' version) is a very entertaining gallery of unexpected physics effects, all explained without using math.

If you ask the internet, it's full of affiliate links ( no surprise) but having searched to refresh my memory, the recommendations at live science look very reasonable.

https://www.livescience.com/best-physics-books

Of course, they list the Feynman lectures on physics, which are a classic, and which are freely available from Caltech.

https://www.feynmanlectures.caltech.edu/

Learn from a master!