Upon death, without a Will, your spouse (which includes a separated spouse) will receive your entire estate unless you have children that are not your spouse’s children.
In that event your spouse will receive the first $451,909 approximately and half the balance of your estate plus all of your personal chattels.
The balance of your estate will be divided equally between your children. Your spouse will have the option of buying your interest in the matrimonial home.
If you have no spouse nor children your closest living relatives will take your estate. That is, your parents or the survivor of them if they are alive, then your brothers and sisters, nieces and nephews, grandparents and then cousins.
The estate gets paid to the Government in the event you have no relatives that can be located.