I’m talking to a guy from the upper shelf. He went to Peter to bury his brother. He tells us:
We wanted to go to my sister’s house to celebrate my birthday.
Are you a lot in the family?
I alone remained.
and?
There are many sisters, but they are all grandmothers. Who will be born? Only I remained.

Not everyone immediately understood what he was talking about. The guy is convinced that genes are very important, and they are transmitted ONLY by the male line. For example, he has another brother, but he is from his mother, so it is not counted.