Should I buy my family’s liquor store?

The store has done 1-1.2m/yr for sales consistently for the last 5 years, the owner is willing to me finance through himself over a 6yr period with no interest on inventory (≈120-150k) and 4% on the store cost (≈300k). I have a breakdown of the Loan payments and store revenue/profit aswell, just don’t it with me to reference while I’m posting this.

I am 21 years old so I know it’s a very big jump but after a couple months of learning the accounting side of it and licensing I don’t see it as unreasonable.

Any questions/suggestions/ or insight would be much appreciated.