As a prank against Ron and the twins, Harry lets loose a tale about the Weasley's secret "Red Grimorum". The true reason why for the past several generations, the Weasley's have had large families, even though they usually take pureblood mates.
What are some of the reactions amongst the other pureblood lines that have problems with fertility.
What are some of the reactions amongst the other pureblood lines that have problems with fertility.