Probably he's his grand-grand-grandn-son, where somewhere down the line his descendent got out of the elf kingdom and married a human, and the house-husband job, black hair and eyes just popped out of atavism.
Or IDK, since the premise is already bonkers to the eleven, I'm not sure we should...
My condolences for the family and friends, and rest well, Mike. Thanks for all the vanilla and fluffs you had helped to convey for us and the world to enjoy, and I hope all this vanilla and fluffs still reached you up there for you to enjoy too.