The Oak's Shadow (2015)

Original title: La sombra del roble

Jorge, a biology teacher, lost his wife 5 years ago, and has not been able to overcome his grief. His children consider their grandfather Roberto as their main father figure. Everything changes when the latter is diagnosed with Alzheimer's disease, and they have to put him in a rest-home. It is then that Jorge reconsiders his damaged relationship with his father and children.