Many parents are like you. typically, I recommend:
1) Rent piano hourly from local piano retail store. If you find it TOO mah fan, then...
2) You can buy a 2nd hand piano from a reliable dealer. Costs significantly lower, and if you resell it you won't be losing so much.
3) Buy a Roland digital piano, they are alright for beginners until Grade 2 ? (You have to buy the models that are weighted like the acoustic piano) I used to be quite against this, but now they are really well made. I allow it for new students until they are sure about buying a more expensive acoustic piano. Roland models that are good start at $ 15000 brand new.
4) Rent pianos to your home- but these are not going to be good condition or nice pianos. And if you calculate the costs, after 1-2 years of renting, you might as well have bought a 2nd hand piano.