We must completely abstain from lying, slandering, backbiting, cursing, abusing, giving false witness, vain talking and all other foulness that could come out of our mouth. Prophet Muhammad (s) has told us that if we can protect what is between our mouth and legs then he can guarantee a place for us in Paradise.
You will find that as your child grows older, he is more likely to backtalk. This is true of my eldest. He is 12 and is beginning to question what we tell him rather than accept it quietly like he used to. He is beginning to question authority and as long as it’s done in a respectful manner then it is alright. In this situation, I would explain to him why and stop there before it becomes a back and forth game. But if, and when, it becomes unacceptable I need to be patient, to listen and understand. In this way I am modeling the correct behaviour as well as being calm and in control. True communication can only happen when both sides are calm. So do whatever is necessary to calm both sides.
Be aware of what’s coming out of your mouth. Ask yourself if it’s going to hurt anyone.
Teach your children that swearing and backtalk is bad.