Very sensible children, in fact, the thought is more important than the gift, especially for parents, let them feel your thought, the gift is just a form, but it is a happy thing to receive a gift on birthdays, isn't it a very happy thing that dad reads a lot?
From childhood, you can know a lot of knowledge and hear a lot of stories, so don't say dad is a nerd, choose a gift carefully, since dad likes books, you can give him a set of books he likes.
Make a real-life doll of the whole family portrait, dad will definitely be very happy, put it at home and have a very family atmosphere. DIY cups, make photos on them, and the family will be together at any time.
There are many other gifts, you can choose, there must be a gift you like, I hope it can help you.