It’s a joke, I don’t quite understand it, please explain. A lot of information

Personal analysis. Poor analysis is a shame. . .

First analyze the first sentence: Once upon a time there was a child. This proves that this story is some distance away from the present. According to the development situation at that time, it should be normal for a monogamous couple to have no affair. So let’s skip Mom’s death and go straight to Lao Zhang’s death. Judging from the context, who should be called dead, then it proves that the child was actually born to Lao Zhang and his mother. This one is easy to pull out. So according to our analysis of the first sentence, this situation was not allowed by the world at that time. So why did the mother still have this child with Lao Zhang? There must be something hidden in it. I think it should be that mothers and fathers cannot have children, at least they know they cannot have children. What are the reasons why two people can't have children? Generally speaking, one of the men and women has no ability. Looking at it now, women don’t have the ability to rule it out. So men are incapable? From the context, it is basically impossible to infer this. Then we look at another possibility, which is that the mother and father are related by blood and cannot have children. So have we seen such a person appear in the context? There is only one, grandpa. In other words, we can make a rough analysis and inference. Dad is the child of grandfather and mother. Then it can be inferred that the mother cannot have children with the father. Since then, the entire rough analysis has ended, so why was the ellipsis added after grandpa died? I think there is one sentence missing, which is: I called grandma, and my mother died again.

My humble opinion. . . Hope the watch sprays me. . .