Hi Mrs ferr,
Is your mother named in the will? Your father's estate will be distributed in accordance with his will. If he doesn't have a will it will be distributed under the laws of intestacy.
Or are you talking about a family provision claim?
If your parents already divided their property through the Family Court this will usually preclude a former husband or wife from successfully claiming further provision. However, applications can be entertained by the court in rare circumstances if things have changed significantly since the Family Court orders were made.There is no prima facie "entitlement" to family provision though.