The Father reminded me of the art of losing brought up in the film, Still Alice. According to the art of losing, we should be ready to give back whatever that is bestowed upon us sooner or later. In my opinion, death could be such a great blessing compared to absolute senility when you gradually get alienated from yourself and your surroundings.
On the other hand, I made some association between The Father and About Schmidt acted by Jack Nicholson as a retired old man who fails to interact with the people around him, even the closest ones due to old age and a feeling of insignificance.