This is not your problem. You and your brother need to let your father live his life. If you're annoyed that he's not contributing to the household, then you need to move out. You're both adults, and it sounds like your Dad worked incredibly hard before his operation to provide for you while you were growing up. Now you're grown, time to leave the nest and fly. I would be so fucked off if I got a heart attack from overworking to provide for my family, only for my grown child who still lives in my house to call me lazy after not getting more work. You're coming off as incredibly ungrateful here.