The affirmative is False.
A person who dies intestate, meaning that he/she didn't leave a will, has the property shared out according to the intestacy rules.
When it comes to married or civil partners, they can inherit property only if they are legally married or in a civil partneship at the time of the death.
The rules for children depend on having a married or civil partner alive, and for grandchildren or great grandchildren depends on having their parents or grandparents alive.