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Purchasing a home using collateral
Since you only own half of the house, you would most likely need the cooperation of whoever owns the other half in order to use it as collateral for a loan, but if you can do that, there's no reason you couldn't do what you're talking about.  The complication is that if you default on the loan, the bank isn't going to seize half of the house.  They'll repossess the entire house, sell it, and take what they're owed out of the proceeds, leaving you and whoever owns the other 50% to fight over the remnants. Even if the owner of the other half is family, they may be hesitant to risk losing the house if you don't pay your mortgage, so this could be a dicey conversation.