This is referred to as Intestate Succession and there are rules set out in the Intestate Succession Act (and summarised below) explaining who will benefit from your estate should you not leave a Will with specific instructions.
It is advisable to ensure that you have a Will in place and that you review it periodically to ensure that it is kept up to date and that your estate goes to the people of your choice in a manner which is in their best interests and the interests of your estate.
This article is for general information should not be used or relied on as legal or other professional advice. No liability can be accepted for any errors or omissions nor for any loss or damage arising from reliance upon any information herein. Always contact an attorney for specific and detailed advice. Errors and omissions excepted (E&OE)