i found out that in ''Appa's Lost Days'' Appa flies over a few Watertribe warships... this is right after he flees from the attack of Azula. One guy sees him and keeps watching him. considering that this guy got a special close-up, he might be more then ''just a water tribe peasant''. he might actually be the father of Sokka and Katara...
ofcourse this is just a guess, but its fun talking about it right? no one??just gets a close-up in the avatar show, so it might be true. i though about Bato, but after i compared the 2 i saw that its not him... if it IS the father itll mean that he's pretty close to BSS which is the place where Aang and his friends are right now.
What do you guys think about it?