That old saying with kids is true, monkey see monkey do.
This isn't just true at home, but in all environments children spend any length of time in; sports, school, church, etc. If your child shows behaviors you don't approve of, look in the mirror first. If you don't think home is the root cause, pay attention to what is going on in their other environments. We as parents have the great privilege to be able to mold and shape our children into the wonderful beings they have potential to be.