No need for apologies, customers get confused with this all the time. Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
If the lease expires on October 31 then legally they would not have to be out of the apartment until October 31. If the complex is asking that they move earlier than that and the couple agrees to do so based on the written notice from the apartment complex asking them to vacate by October 26, then the couple should get a credit against the number of days they are not in the apartment to October 31 and they would have a right to seek that amount back from the landlord, since the landlord told them they had to vacate earlier than their lease provided. They are allowed to pay up to October 26, since that is when the landlord told them they had to leave by.
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This is NOT the practice of law nor is it legal advice to you, it is merely educational information for you to use to seek out a licensed attorney in your state to get actual legal advice from them. Please use sites such as http://www.martindale.com or http://www.lexmundi.com or http://www.hg.org to find a local attorney to get actual legal advice in all matters.