The Wrap
http://www.thewrap.com/m-night-shyamalans-sundowning-stars-kathryn-hahn-ed-oxenbould-exclusive/
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According to The Wrap, Kathryn Hahn (pictured) and rising child actor Ed Oxenbould are set to star in the flick. Hahn plays a single mother whose two young children visit their grandparents… and things go very wrong. Oxenbould plays her son, who is protective of his sister.
No other plot details were immediately available, as Shyamalan prefers to surprise his audience. However, “sundowning” is described as a psychological phenomenon associated with increased confusion and restlessness in patients with some form of dementia. Symptoms also include agitation and mood swings.