Mr. Vampire II (1986) on Netflix

Grave-robbing Professor Kwok Tun Wong [Fat Chung] and his bungling assistants, Chicken [Billy Lau] and Sonny[?], make what they think might be a major find--three corpses from the Chien Lung reign. One is a woman, another looks like her son, and the third looks like the father. A family! Not only are they dressed in clothing and jewels from that period, but the corpses themselves are perfectly preserved. In fact, their flesh is still soft. The discerning viewer will recognize, of course, that the yellow talismans pasted on the corpses' foreheads are wards against the undead. This is not an ordinary family...it is a family of chiang-shih!