'Descendants' in the Bible

Most certainly I tell you, all sins of the descendants of man will be forgiven, including their blasphemies with which they may blaspheme;

"Teacher, Moses wrote for us that if someone's brother dies and he leaves behind a wife and does not leave a child, that his brother should take the wife and {father} descendants for his brother.

There were seven brothers, and the first took a wife. And [when he] died, he did not leave descendants.

And the second took her, and he died without leaving descendants. And the third likewise.

And the seven did not leave descendants. Last of all the woman also died.