The rumors (no pun intended) that her father, Bruce is battling dementia
This likely can explain why Bruce has been churning out so many trashy movies of late for a quick payday or why Bruce doesn't seem to emote too much in his more recent movies.
https://www.reddit.com/r/blankies/comments/sdi5jo/stop_making_fun_of_bruce_willis_hes_legitimately/
https://www.reddit.com/r/movies/comments/s4ghuh/what_the_hell_is_going_on_with_bruce_willis/
https://www.reddit.com/r/movies/comments/otysa0/what_happened_to_bruce_willis_what_factors_led_to/
https://www.lipstickalley.com/threads/bruce-willis-allegedly-battling-dementia.4840718/
I noticed that on Rumer's Instagram, she has the comments limited. So naturally, it's awfully difficult to straight up ask her if these stories about her dad's health are true:
https://www.instagram.com/rumerwillis/