They are sometimes on deathrun too, but i talked with ''both'' and they said they are brothers.
I'm not so good with the ips, ids, etc.. but we have the same ip when we play on the same internet connexion or 1 computer = 1 ip ?
Two computer in the same house passing through the same router -> same ip
Two different installation of UrT -> two different id
So they can have the same ip, but if they have the same id too he is probably lying, usually i look if they both play at the same time...
Plus in deathrun many times some player connect two times so they can choose in which team play, the other one is usually afk