Parents and their teen child might end up going through some misunderstandings about things such as grades, or how the teen acts. Some parents might have good intentions, but end up doing what they think is okay in the wrong way, and their child will end up getting hurt or upset in some type of way and lose trust in their parents. Of course, there are other situations that might be about a teen's sexuality or who they're dating. There are all kinds of problems that can take place while a person's child is a teen, or any age, for that matter.
But of course, it might not be something that the teen is doing, but the parent. Sometimes it is the parent that can be the only wrong one. The parent can be abusive, or just not be there, which can make the parent's relationship very bad as the child is a teen.
Sometimes, it's not that. A parent could be in jail while the teen still loves them very much, but because of..well, jail, they can't really have a normal relationship or see each other on a daily basis like a normal loving family would.