It's not natural for children to apologize. I want to show you How you teach this important value through a book.
I remember my daughter when she understood she was wrong, she refused to apologize.
my 9-year-old son when he understands that he is wrong he cries, he's angry he runs to his room and can't handle the shame feeling.
Regret is a hard emotion.
With adults it can be the opposite:
They can say "sorry" very easily, but do they feel sorry? not always.
Do you know how to say sorry and feel those regret strong emotions at the same time?
As a children's storyteller- I tell kids stories that deal with emotions.
Through someone else's story, a child will see how it should look like.
Here is an example of a book that deals with -the full circle of sorry:
A quarrel, anger and then regret, feeling sorry and more important- understanding the truth of someone else.

Sorry! by Norbert Landa, Tim Warnes

What happens to the rabbit and the bear is exactly what happens to us in life-
They are great...

should you continue reading to your children once they know how to read by themselves?

YES!!!

Here's Why: 
1. Remember when you learned to drive a car? you could only concentrate on - shifting gears, driving carefully- you couldn't enjoy the view or daydream, right?
Reading in the early years is the same: It's technical and doesn't give you a reading enjoyable experience

2. The books Children can read in their first reading years on there own, are of a low standard of their intellectual needs. The books that can fascinate an 8-year-old is not necessarily a book they can read alone.

3. If they are forced to read by themselves, they succeed to read books that are not really fascinating for them (because fascinating books they cannot still read) so then they come to the unfortunate conclusion that books are childish and boring. (don't forget- screen time is always their seducing and tempting with quick and easy wins)

4. Reading to your children is a temporary...