The Sons Of Katie Elder (1965)

The Elder boys return to Clearwater, Texas for their Mother's funeral. John, the eldest, is a well-known gunfighter and trouble follows him wherever he goes. The boys try to get their ranch back from the town's gunsmith who won it from their father in a card game, after which he was murdered. Troubles come, however, just because they carry the Elder name.

IMDb: https://www.imdb.com/title/tt0059740