The House family was German in origin they were mostly farmers and livestock traders in the wizarding world. It all changed with the war between the goblins and wizards. The family head of that time during the war was Fredric Gregor House. He bought rations from the other factions such as elves and imps and sold them back to both the Goblins and Wizards and became very rich by doing that.
The wizarding wars between other races were beneficial to the House as such because they had amassed much food and clothing that will be required by everyone.
Each time there was a war House would always come out on top they were a neutral party not caring about the politics.
But that all changed during the second wizarding war when the eldest daughter Emilia House sided with Albus Wulfric Dumbledore.
With the alliance of the House in the light faction. The wizarding world was shocked because of this. But it was not all merry because the head of the House family Emilia went missing during the high of the war many believe that she deserted the war fearing for her life but only a few knew the truth.