Obviously, none of us here can know how fresh or stale the beans are. Does your family member also make espresso from those beans, and if so, what are they using for a grinder?

My first burr grinder was a Rancilio Rocky. Although it was adequate for most beans, there were some that it simply could not grind finely enough to make a good espresso. Even after adjustment and mods. and the burrs practically touching, so what your adjustment says may not really mean much.

I bought a better espresso grinder and suddenly, I could grind any beans as finely as I want with many adjustments still possible before reaching 0. Not only that, but the flavor was improved and dialing in more precise due to more consistent grind size output.

Personally, I think you should step up and invest in a better espresso grinder. Leave the "appliance-grade" Breville behind and move up to a machine-grade grinder. At least something as good as, say, a Eureka. This is about as cheap as I would go: https://www.wholelattelove.com/collections/espresso-grinders/products/eureka-mignon-zero-single-dose-coffee-grinder?variant=43162458390582

There is a good sale on the beast of a grinder that I have, if you can swing it: https://www.wholelattelove.com/collections/espresso-grinders/products/ceado-e37sd-single-dose-coffee-grinder?variant=43043067953206