Going guarantor means a person offers up the equity in their home as security for your loan. This is a serious commitment which can have major repercussions if the person is not able to make their repayments and defaults on their loan. In this scenario, the bank will legally be able to the guarantor until the debt is settled.
Not everyone can be a guarantor. Lenders will generally only allow immediate family members to act as a guarantor but this can sometimes be stretched to include extended family depending on the circumstances.