"A Dog's Mission", "Forgotten Time", "The Story of Loyal Dog Bakung", "House of Great Fortune", "Spirit Dog Shirley"
If the old people like war movies I would recommend-
"The Red Guards of the Honghu Lake", "The Wolf of the War", "Little Soldier Zhang Ga", "Wisdom Takes the Tiger Mountain", The Tunnels, Operation Mekong
Because I don't know what type of movie the old man in your house likes, I recommended it based on my grandpa's preference~