Steve Jobs started Apple in his parent’s garage.
Michael Dell started Dell Computer in his dorm room at the University of Texas, with financial help from his parents.
This is a historically common practice, it has it’s risks (if you fail); but a family member who has the money, may be a better alternative than a bank in many cases. Lower interest rates - and freedom to run your company with minimal oversight.
Sheez !
And banks don’t lend to start-ups (no collateral/high risk).