Which home would you prefer to buy:
$150,000 at 15% over 30 years. $350,000 at 4% over 30 years.
Hint: they both have approximately the same total loan cost and payment.
You can do this calculation with your parents. My home cost $350k at 3.8%. My parents bought my childhood home for $88k at 8%. Adjust my parents' home price for inflation and run the result through a mortgage payment calculator. You find that I paid slightly more for my home but my home is much nicer (central heat and air, closer to town, larger, better schools, etc).
My parents' home happens to be for sale currently (not by them). If I paid full asking I would pay MORE in raw dollars but LESS in inflation-adjusted-total-loan-cost (which is what actually matters).