Mr. Jarrah was the father of Sayid and Omer, and he was a soldier in the Iraqi Republican Guard.
Sayid's father ordered a young Omer to kill a chicken in order to prove his maturity. When Sayid killed the chicken in Omer's place, the father mocked Omer and congratulated Sayid for being a man. ("He's Our You")
Tariq told Sayid that his father would be ashamed if he knew that Sayid was helping the Americans, describing him as a "great hero". ("One of Them")
Hassan is of Arabic origin, and its meaning is "good-looking, handsome"; it is a popular name in the Arabic world.
In the casting call he was described as "Father, 40s, must speak Arabic. A domineering and quick-tempered father who's trying to bring his boys up properly. Feels he has to teach his son a lesson about how to be a real man."