Family or not, they should respect the fact that it’s a business and you have bills to pay.
Set some boundaries before their “free supply” starts costing you your livelihood. 😅
I run a small café and cycling shop, and most of my family is supportive.
But a few relatives treat my business like their personal free supply depot.
My uncle comes in with friends, expects free drinks and snacks, then jokes that he's “keeping me in business.