So that would make the cop also his grandson?

1. That’s not a theory you came up with yourself lol that’s been floating around for awhile since the whole milk thing 2. You’re joking about 001 and the cop being brothers right lol that’s the whole premise of season 2 lol that’s his brother and when 001 is talking about his sick wife that’s the same wife the cop is talking about with his mother at the dinner table visiting her grave

Do we know about anything about the old 001's family? All I can remember from season 1 is that he was wealthy and I think he organised these games for years until he finally wanted to play as well.

No, cause the Frontman played in the game and won, but he played in the first place to get money for his wife’s treatment. The old man was very rich, if they had a good relationship he would have given him money, if they had a bad relationship In-ho wouldn’t have become the frontman and be by his death bed especially losing his wife.