From the author: I don't believe in the theory about Vincent and Undertaker being related ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯. The names Silver (Undertaker. !!Spoiler!! taken from his nickname as a reaper, Silver Fox) and Samuel (!!Spoiler!! one of the twins Phantomhive) are not canon, just for convenience (The user is Vincent Phantomhive)

It was a typical evening in their apartment. Vincent sat in the kitchen and drank coffee, listening to an unobtrusive melody from the radio. He heard the door open and something fly into the wall. Looks like someone is tired. He came out of the kitchen and saw his husband. A not very tall man dressed all in black, with long white hair, numerous ear piercings and a scar on his face that he received in a car accident many years ago, but for Vincent Phantomhive he was still beautiful, looking menacingly around with his yellow-green eyes. The pathologist is clearly tired