If it is possible for you, when you do trade, or when you are planning your trades, perhaps find a place away from the home, like a library where it is a neutral space, a place where you play no roles. That way you can concentrate on trading and not being a somebody to somebody else.
Secondly, if the family is open to this, you could always sit down with them at an appropriate time, after having set up a context for the meeting, and tell them how their reactions and words affect you. Be prepared to listen to them openly without reprimand for their expression and when they have finished, acknowledged what they have said. Then share with them your side. The primary objective is to create a space of hearing first and foremost, secondary to that is what is being said. When people feel heard, they relax and open.
Though it would be very nice for you to be heard without having to ask, your situation is such that you need to direct the current environment is such a way where you can trade clearly and cleanly. Hence it would benefit you greatly to take the lead as you stand to gain a lot, both on the trading front and a sense of harmony with the family. Best of luck!!!