A complaint was laid before the local authorities.

After a long deliberation and careful review of the case, and to eradicate such "unnatural offspring", as they were termed, it was decided that the two offenders, and all their children and grandchildren should be burned to death, which sentence was duly carried out.

I doubt if the story is authentic.

It was probably fabricated by the author that it might serve as a warning.

The sentence, if true, was too severe; the offspring who were innocent contributories to the crime deserved pity rather than punishment; the judgment passed on the real offenders was also unduly harsh.