12 - The Other Brothers Elric (Part 2)

You can watch Fullmetal Alchemist Episode 12 HERE or HERE.
"-Oh please Al, they're just using their father
to justify their own selfish causes.
-Maybe... But is it really all that different
from what we are doing?"

Quotes - Watch Online - Trivia

Ed and Al depart from the mansion after Ed is saved by Fletcher. Mugiar, stunned at the damage dealt to the lab, asks the Tringham brothers to use an alternate method to speed up the creation of the red stone. When Russell refuses, Mugiar reveals that he knows the Tringhams are not the real Elrics and captures them. Back at the tavern, Ed and Al learn about Nash Tringham, Russell and Fletcher's father. The original discoverer of the red water, Nash soon left the city and was never seen again after the townspeople began to develop a disease following his research.

The next day, the real Elric brothers are invited to research the red water by Mugiar. They agree, free the Tringhams, and corner Mugiar by asking about Nash. Mugiar responds by attacking the Elrics using the partial stone. With the help of the Tringhams, the Elrics overpower Mugiar, but he escapes to an underground lair. However, Mugiar collapses the underground passage, causing the red water to flood out of the spring. Fletcher, using his alchemy, makes the trees absorb the red water, neutralizing the threat. The Elrics say good-bye to the Tringhams, and board a train for East City.

Sources: Wikipedia, Fullmetal Alchemist