Be in somebody’s good/bad books
Definition 1 of 1
Pro Tip 1/3Emotionally Charged
The idiom often carries emotional weight, indicating strong approval or disapproval from someone. 
After arguing with his coach, he was in her bad books.
Pro Tip 2/3Social Relationships
Used mainly in casual or social contexts, rather than formal or professional situations. 
She shared her lunch with me when I forgot mine, so I'm in her good books.
Pro Tip 3/3Not Literal
There are no actual 'books'; it's a metaphor for someone's perception of you. 
Doing chores without being asked put him in his parents' good books.
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