"It’s no secret that Pureblood families are dwindling. Most nowadays have only one heir or produce multiple squibs. In an attempt to keep bloodlines pure while increasing magical offspring, the Dark Lord has started research into removing non-magical blood from half-bloods." This didn’t seem too shocking to Granger, three years in war gave one lots of time to theorise what the other side's end goal was. "He wants to manufacture pureblood families."