How Do I Teach Respect To A Preteen?

All children seldom turn out the same with the same upbringing. Some kids are more influenced by their own ideas and what they see outside their home. I would advise you to prepare a lecture on the rights and wrongs. Make them understand in detail what is disrespectful and what it does to you and the entire family. Also tell them the consequences of this behavior if they continue it in future. The problem is most of us parents shy away from actually giving out punishments. The thing is if you tell them this is bad and would not be tolerated then when they actually do that, do respond in the way you promise. On the other hand never compare them with the good brother and sister. Always encourage when they do something good.