Since this sounds like an ongoing problem of them coming onto your business as you have said asking for money, etc, WHY have you not attempted to politely put a stop to it?? Or did you and they are disregarding it?
I know I would have done something..
Even though you said your mom was generous, WHY have you not explained that you run things now (I assume you’re a grown man and not a child) and any past generosity has stopped.
Just curious as to what the problem is and why this intrusion still appears to be happening.