It depends on whether your father trades for himself or for others. In addition, you'd better check the charging list, check the charging situation of each variety, and see in detail whether the trading list is specially charged. If it is specialized in charging, first ask which company your father opened an account at that time and who the account holder was, then check whether the account holder is an employee of a futures company or an intermediary of a futures company, and then check the charges in the contract where your father opened an account.