Real Estate Law
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If there are no signed agreements then they have no rights to the property. Any loan is unsecured and they would have to sue and get a judgment before they could exercise any collection remedies.
Anyone with a mortgage interest in the property can foreclose, but the relatives who gave you money without any signed agreement can not take your home.
Only if they get a judgement against you for a deficiency.
If you get a mortgag on the new one then they will still be behind that lender in priority.
They would need to get a deficiency judgment first.