So, first I'd like to tell you guys that the Elder Gods which were so often called the Titans were the parents of the Gods. the Greeks didn't believe that the Gods created the universe. For them the universe created/gave birth to the Titans which were the parents of the Gods. In short the so-called Gods were supposed to be the grandchildren of the universe. Sorry if i'm being too confusing but that's about it.
The Titans
so the "Titans" were like really strong, and huge! i totally have no idea on how tall but have you ever watched Lightning Thief ? in the last part of the movie Percy Jackson (Poseidon's son from a human) went to Olympus to give back the lightning bolt that Luke (the son of Hermes another half god half human or demi god just like Percy ) stole to bring war among the Gods. As he entered the Room were the gods were fussing over the war that was about to begin in two minutes, he saw gigantic sized Gods. (what was this about again? im sort of drifting, this is about the Titans so why am i talking about this Gods.. anyway..) I think that the Titans are bigger than the Gods. So if Hades said to Cassiopeia that humans were just specks of dust to them (forgive me but I love this movie Clash of the titans you should watch it too! okay back to the titans) then we would be to the Titans.. like...Germs?..(just joking..come on..i dont want to be a germ..do you?..well i know you dont.jejej XD... why am i answering my own questions?..that really sucks!)
How the Titans were dethroned
okay ..this part ill give them to you later..promise!