Grandson of Voldemort (On hiatus)

On hiatus
Will is a normal, everyday, twenty-year old Half-Blood. It's been six years since the giant war and he's settled down, ready to live a relatively normal life with his husband, Nico Di Angelo, and a monster attack only once in awhile. He was wrong about that.
It's been two years since the battle of Hogwarts and things seem to be becoming normal again. That is, before they find that Voldemort wasn't the last heir of Slytherin and that he had a grandson.
There are a few stories where Voldemort is Percy's grandfather or related to Nico in some way, why not change it up and make Will the grandson?
I don't own the books, characters, setting, fanart, well basically anything in this except the plot.