John Gill Commentary Luke 20:29

"There were therefore seven brethren: and the first took a wife, and died childless;" — Luke 20:29 (ASV)

There were therefore seven brethren
In the place where these Sadducees dwelt; or, however, that were known by them; at least they supposed such a case, and it might be fact: and the first took a wife, and died without children ;
son or daughter, and so had none to keep up his name, and to possess his inheritance.