Continuity mistake: When Eli enters Daniel's office, as he goes to sit down his hand move from in his lap, to his side, then back again.
Other mistake: While laying the pipeline toward the ocean, the pipe is being joined so that the female end flows into the male end. The male end should flow into the female end.
Continuity mistake: In the ending scene with Daniel and Eli, Daniel starts yelling at Eli as Eli is running down the bowling alley. As Daniel is throwing bowling balls at Eli, the first ball is thrown down the left lane, hits Eli in the foot and ends up in the right lane - no pins have fallen. The second ball is thrown down the left lane and is a gutter ball - again no pins have fallen. The third ball is thrown into the right lane, hits a bucket and presumably hits no pins. However, as Daniel is chasing Eli behind the bowling alley you can see that the left lane now shows only 2 pins still standing.
Continuity mistake: In the final scene, in the bowling room, Eli Sunday downs one of three drinks and sips on the second. He gets up, but in the next shot there are two empty glasses instead of one.
Answer: There is nothing in the film to suggest anything other than that they are brothers. Paul sells out his family, takes the money and goes away. It is only natural that they would not want to speak of him later on. Daniel on the other hand, keeps a certain track on Paul, especially since he also got into the oil business and became a minor competitor to Daniel.
Twotall