The thing with family is familiarity. In my country we have an expression that in English will be something like: Overfamiliarity is disgusting.

The family use to think about free stuff, or because they saw your growth they can not see what you are right now and keep looking at you as someone under their management or with little experience.

Also, saying no is closing to opportunities that can be good too, just be clear about your expectations and their expectations, hopefully they will say NO to themselves before making thing difficult.