The potter's were always considered the most influential families after the founder's and Merlin himself. Being the member of sacred 28 families even after Jameson potter marrying a muggleborn was a feat in itself. So what does the Potter Grimoire hides??
It wouldn't let it's last heir be ignorant of his heritage.
What if Harry potter got hands on the prestigious Potter's Grimoire at the age of 6.
The saviour of the wizarding world is nothing as everyone expected especially dumb-as-a-door and no-nose
The wonderful cover is made by very talented _littlebitcrazy_