To an extent. The narrator is intent on maintaining control of the story, and will occasionally skew the truth or make things up to try and get Stanley to do what he wants.
The Narrator says "Stanley is addicted to drugs and hookers" at one point, but this line is more him just insulting the protagonist while frustrated during an attempt to try and get him to stop wasting time in a specific area.
In a way? For some endings the narrator will place Stanley in scary, possibly inescapable situations just to watch him frantically try to get out of them.
One of the prompts in the apartment ending is to read your kids a story, implying that Stanley is a father. Stanley dies in several endings. Given that the Narrator says that Stanley's wife isn't real, however, it's debatable that the kids are real either.
No, but it's worth mentioning that a big thematic focus on the game is our perceived control over our own lives. It plays around with choice (or the illusion of it) and breaks the fourth wall in some endings, revealing that Stanley's actions are nothing more than the player's decisions. Some of the endings could be particularly triggering for individuals who live with psychosis, as they can be surreal and tend to reinforce paranoid thinking.
one of the endings if not multiple end with extreme anxiety/panic attacks surrounding derealization which could potentially be very triggering but it's not certain that one will get those specific endings
Two endings involve the player jumping to their death while the narrator mocks you for making this choice. A full list of endings can be found on Google.
The camera gets shakey during the last 30 seconds of the explosion ending (If it's too shakey then don't worry about it, you technically don't need to play during these 30 seconds)
One ending involves a self-destruct sequence. A giant timer counts down, and when it reaches zero the screen goes black, forcing the player to restart.