The truth is, a lot of women lie about the paternity of their children. If you tell her, she may feel insulted and even threaten you. Which is why you must not tell her. You can test your children without your wife knowing. Buy a test, test one child, send the test in and get the results. Move on to the next and the next. Do this until you have all of the answers. There needs to be a conversation either way. If you discover your kids are not your own, you need to talk to her. If you discover they are, you need to talk to her, explain what you did and why and talk openly and honestly. If she chooses to leave, then that is her choice. We all have choices in life and actions always have consequences. If she is willing to throw away a marriage because you doubted her, then that is a choice she will have to make. But do not her fear, anger or threats stop you from getting the confirmation you need.