Under normal circumstances, people's life span is determined by the complex interaction between genes and environment. Genetic factors will affect a person's health and disease risk, but it does not mean that children will inherit the life span of their parents. Other factors, such as living habits, diet, exercise, etc., need to be considered in the prediction of specific life span.
It is worth mentioning that genetic factors are only one of the factors that affect life expectancy, and other factors are equally important. Therefore, it is not possible to infer whether the life span of the granddaughter's wife is short by virtue of the short life span of her mother-in-law and daughter-in-law.
It should be noted that everyone's life span is unique, and whether it is genetic or environmental factors, we can't completely predict a person's life span. Therefore, we can't judge individual longevity only by family longevity tradition.
In a word, life span is a complex problem, which is ultimately affected by many factors. Therefore, it is impossible to accurately predict whether the granddaughter's wife will be short-lived through simple genetic factors.