The Female Solution: When Should You Reprimand The Other Parent's Child?

Child rearing is a subject that couples need to discuss when they reach a point of decision about building a long term relationship.  If there are older children from previous marriages, this can get complicated if the children are not clear on who is allowed to exercise authority over them.  When and how should you reprimand the other parent's child? Who should be responsible for enforcing the authority of the other parent? Does authority begin after marriage or at some point during the courtship? What if children display disrespect toward the other adult, what should be the consequences?