I have an aunt who is into grocery sales, and basically, there is no way that your family wouldn't interfere, it is a big one and they do have large sales. The challenge she was having back then was that the children would come and take what they needed without paying because of the family title, they do have this entitlement, and the bad side of this is that there will be missing sales or a shortage of money at the end of the month.
She did something incredible about it and mandated that whenever they visit the shop to pick up any item, they should record it even if they don't drop money. This helps her balance her credit and debit at the end of the month, and what she was doing at the end of the day is charging their father for the items they did pick. She believes a business should remain a business, but that doesn't mean she wouldn't support them at home; if it weren't for the records, they would have rekt her business progress.
Let me also use this opportunity to say that small businesses should always follow the "entity concept" in business which states that a business is different from the owner of the business. So whatever relationship you as a person has with someone else, that relationship does not include your business. She may be your aunt but the business is not your aunt.
Your aunt was smart with the idea she came up with because if she hadn't done that her business might be suffering and it would have been worst if she doesn't keep records because she would have no idea of what is going on.
but in many countries that knowledge is not taught until you get to college, giving a massive advantage to those that reach that level of education over those that do not.
In a lot of countries, it's not even taught in college. Only students that are in the social science and Management science department have the advantage of learning this and even there it's not handled like an important topic or course. A lot of people who know these things didn't learn this from school.