In case you haven't noticed, ALL purebloods have been hexed. The hex makes them want to get married and have children. Now considering that magic only requires consent and these people are consenting, they are getting fucking married. The best we can do is ensure that they use the new spell so that they can get divorced once we fix them.
We've been casting healing spells that we were taught by a healer who probably would fix this in a day except you know he's bloody busy finding a proper wife, so we need help. Anyone with any healing background, anyone with books (we think this spell is likely found in books cursed to be read by purebloods only so don't do anything stupid), we'd love the help.
It also seems that purebloods who are already married with children aren't going crazy. Maybe we can ask their help to keep their children/grandchildren/relatives safe, but honestly I think it'll be impossible to stop them from 'starting the perfect family' and we should concentrate on finding a cure.