Requesting an enganging but easy to read book for an adult and a great book that it’s difficult to dislike

Hello, this is my first post here and I need help. So my mom and dad were really avid readers when I was young, but as they have been getting older they have started reading less and less to the point where they don't really do it anymore. So I want to gift them and my brother a book to give each one them a little gift that I hope they like and to see if I can help them get into the habit again. My father is easy, I'm already set on gifting him "Sapiens" which I know he'll like.

My mom and my brother are the difficult ones.

My brother doesn't like to read anything that isn't for school (he's sutyding medicine so maybe something in that area), the few books that he has read and said to me that he liked are the first Narnia book, and the maze runner saga, but this was when he was a lot younger. More recently he surprised me by buying two science books (cattered towards the general public, not too technical) and reading one of them. As you see I don't have a lot of clues about which book he may like, I am inclined to gift him the collection of Narnia books, but am not so sure because he read the first one a long time ago, so I ask for a recommendation of a book that's generally loved by everyone. I am of the idea that he doesn't like reading beacause he hasn't found the right book yet.

My mom is also difficult as she stoped reading because she got treated for cancer when I was in high school and after that she has told me multiple times that she has trouble remembering the things that she reads, so books that are too dificult and sagas are not an option. She was really invested in the Game of Thrones books but stopped reading the fifth one midway because she couldn't remember things from previous books. She also read and liked all of the Accursed Kings saga, she read and really liked The Pillars of the Earth, she read a lot of Isabel Illende novels when I was little (she let me read one and it was my first introduction to reading), she liked the psycoanalyst, she liked Angels and Demons (maybe another Dan Brown book would work) and lastly she didn't love the neverending story (I thik it was too fictional for her).

I hope the examples are enough, my taste in books is very different to my mother's so I don't know almost any book in that can fit the criteria of being similar to the ones mentioned but also not super complicated.

Sorry for the long text, and I sincerly thank you for any and all recommendations.

PD: why is it so hard to write on mobile?