A mortgage. What he’s looking for is a mortgage. There is a place that gives you the money to buy out your siblings, all they ask is that they temporarily own the house (you can stay living in it) until you pay them back. It’s called a bank, sometimes a credit union, sometimes a building society. Amazingly, they even give you much lower interest rates than a standard loan, and you can have up to 30 years to pay it back so you can manage it on your salary.