buying someone's house that has a reverse mortgage?

The graduated house buyback doesn't influence the BUYER. It influences the SELLER. The home buyback should be taken care of when the merchant moves out, passes on or sells the house. That emerges from the deal cost. Indeed, your family can get it. They should think of the deal cost, initial installment and the wide range of various costs identified with it.

There are traps in dealing with those kinda things. Please take a caution to prob and study before your pursuance. So far so good,  but you might meet a rabbit hole to trap your soul for good. Any large sum of deal must gingerly think through. It takes time to cool down your ardent head a bit. Relax and take stardard approaching.

There is NO difference between a traditional mortgage and a revers mortgage when the home is sold. In both cases, the buyer pays off the mortgage from the proceeds of the sale.

The buyer does Not need to think about the reverse mortgage the seller is responsible for that 

The seller is obligated to pay off the reverse mortgage when the house is sold

The buyer has no responsibility 

The closing agent simply pays off the mortgage (whatever the current balance on it is) when you buy it, using some of the purchase price.  For example if the seller has a reverse mortgage with a current balance of 100K and you pay 200k for the house, the closing agent will send the bank 100k of your purchase price to get rid of the reverse mortgage and the seller keeps the rest. This happens all the time, its not a problem.

In the rare cases where the reverse mortgage amount is more than the purchase price, this is a short sale, a huge pain in the a** to handle (if the house even can be purchased by getting the banks approval) and I'd just suggest you walk away from the deal immediately.

It doesn't affect the process for the buyer as long as the purchase price is high enough to pay off the seller's mortgage.

As the buyer you will have to deliver funds to the escrow/title company. That means you provide a wire transfer or cashier's check for your down payment. It also means you complete the mortgage application for any money you're borrowing and make sure that your bank wires the loan funds to the title/escrow company at the appropriate time.

The title/escrow company uses the money you provided (including the money from your loan) to pay off any debts against the house including their mortgage. This is the same whether its a traditional mortgage or reverse mortgage. The seller's mortgage should not affect how the process works for the buyer unless the sale price doesn't cover the seller's mortgage and other fees, in which case you have a short sale situation.

Their mortgage is not relevant to you. You'll be taking out your own mortgage; and when you buy, that will pay off (hopefully) the other person's mortgage. 

exactly the same as a regular mortgage. No matter how many times you ask.