Here is a list of 10 secrets kids/teenagers keep from parents. Kids and teenagers are becoming tactful and some of these do work.
Teenagers nearly always hide their smoking habits from parents. They would hate to know the consequences of their actions. One girl hid in people’s cars outside her house to prevent her mother from seeing.
Teenagers almost never admit to parents when they have sex for the first time. I know one 15 year old who never told her mother she was pregnant until 7 months into her pregnancy. The mother never put the pieces of the puzzle together.
If children are being bullied, they will not always be read to admit it. In fact, many bullies threaten their victims to keep silent. You need to watch for signs of bullying to know when kids keep secrets.
If kids/teenagers damage an item that is not theirs, they almost always fail to admit it. I know a 16 year old who scratched a kitchen table and only told his parents the year after. He wanted them to cool down.