Summer Snow (1995)

In this Hong Kong comedy drama a father's illness brings him closer to his daughter-in-law. May (Josephine Siao) is married with a teenage son. She works as an executive in a trading company. After her mother-in-law drops dead from a stroke, she and her husband, Sun Bing (Kar-Ying Law), reluctantly take in Old Sun, a former air force lieutenant (none of his other children will take him). The family is immediately thrown into turmoil as they try to deal with Sun's strange behaviour. He frequently wanders away, acts strangely, and suffers from rapid personality changes alternating between a child-like and extremely irritable state.