Although John Wayne was old enough to play the father, the dynamic between the sons of Katie Elder is a fun one, besides the fact that John Wayne and Dean Martin could never in a million years be brothers.
Otherwise this is a relatively typical western with a menacing bad guy who has control of the small western town facing the brothers who are in the right. However, the town ultimately turns against them thanks to corruption and the stupid bravado of an inexperienced deputy. The balance is finally returned and justice is dealt, but not without some bloodshed of course.
Besides Wayne and Martin, there were some memorable turns by James Gregory, George Kennedy, Paul Fix, and a few others.