en_tn/luk/20/28.md

if a man's brother dies, having a wife, and being childless

"if a man's brother dies when he has a wife but does not have children"

the man should take the brother's wife

"the man should marry his dead brother's widow"

have a child for his brother

The Jews considered the first son born to a woman who married her dead husband's brother as if he were the son of the woman's first husband. This son inherited the property of his mother's first husband and carried on his name. (See: rc://en/ta/man/translate/figs-explicit)