The Jackson House Robbery (Red Dead Redemption 2)

The son and father, living in the Jackson's house, have two tasks: knocking out debt from Strauss and robbing the house. You cannot do this at the same time, you have to come twice. Completed the task of knocking out debt. He did not kill his father, he tied him up. The next time you visit the house, there should be a scene of a showdown between the son and the father, after which, if the son is threatened, he gives out a cache in the chimney where the double-barreled gun hangs. But when I come, I don’t see my father at all, my son lies on his bed and says that this time fuck me all over my face and throws himself into a fight. In general, he does not say anything about the chimney. Someone who came across this, solved it somehow? What should be done for the son to give out the cache?