Mine has that power too, coupled with the uncanny use of pronouns during this time to send it from superpower to an art form. This can lead to immense confusion as the conversation will continue on for a paragraph or two with each side talking about something completely unrelated. Then minutes are wasted trying to untangle the conversation to figure out just who meant what about which topic.

Put her and her sister together and I just leave. They know exactly what they're talking about even though nary a noun has been uttered for an hour and the topics change rapidly, I swear in mid-sentence even. I'm half convinced it's just a ruse to make me and the brother-in-law go insane and they don't have any more clue of what they're saying than we do.