Couldn't
Mary called her old friend, Mrs. Cooper on her 101st birthday to ask how she planned to celebrate her big day.
Mrs. Cooper replied cheerfully, "My children will be coming to stay with me for the weekend."
Mary said, "I am sure you are looking forward to that."
“Of course,” Mrs. Cooper replied, "but it's a lot of work, cleaning and dusting, making up their beds.”
Mary said, “Why don't you let the children do it when they are arrive?"
"Oh no, I couldn't do that,” Mrs. Cooper replied, "they're all in their in their 80s!"