There is only one way to find the answer you seek, and it will not be on this thread. My advice to you is to call an attorney belonging to the Florida Bar. Since she didn't have a will, that causes all kinds of problems. I don't know what you expect to get from marital property though because since she was married things like that will automatically revert to your FIL.
WHAT HAPPENS WHEN THERE IS NO WILL?
If you die without a will (this is called dying "intestate"), your property will be distributed to your heirs according to a formula fixed by law. Your property does not go to the State of Florida unless there are absolutely no heirs at law, which is very unlikely. In other words, if you fail to make a will, the inheritance statute determines who gets your property. The inheritance statute contains a rigid formula and makes no exception for those in unusual need.
When there is no will, the court appoints a personal representative, known or unknown to you, to manage your estate. The cost of probating may be greater than if you had planned your estate with a will, and the administration of your estate may be subject to greater court supervision.
MAY A PERSON DISPOSE OF HIS OR HER PROPERTY IN ANY WAY HE OR SHE WISHES BY A WILL?
While any sort of property may be transferred by will, there are some particular interests in property which cannot be willed because the right of the owner terminates automatically upon his or her death, or others have been granted rights in the property by Florida law. Some examples of these types of property rights or interests are:
Except in certain very specific circumstances a homestead (that is, the residence and adjoining lands owned by a person who is survived by a spouse or minor child up to one-half acre within limits of an incorporated city or town or up to 160 acres outside those limits);
A life estate : property owned only for the life of the owner;
Any property owned jointly with another person or persons with right of survivorship (a tenancy by the entireties, which is limited to joint ownership between a husband and wife, would be one of these).
A person may not disinherit his or her spouse without a properly executed marital agreement. The law gives a surviving spouse a choice to take either his or her share under the will or a portion of the decedent's property determined under Florida's "elective share" statute. This statute uses a formula to compute the size of the surviving spouse's elective share, which includes amounts stemming from the decedent's jointly held and trust property, life insurance, and other non-probate assets. Because this formula is very complicated, it is usually necessary to refer this matter to an attorney with extensive experience in this area of law. Also, if your will was made before the marriage and the will does not either provide for the spouse or show your intention not to provide for him or her, then your spouse would receive the same share of your estate as if you had died without a will (at least one-half of your estate) unless provision for the spouse was made or waived in a marital agreement.
WHAT HAPPENS TO PROBATE ASSETS IF THERE IS NO WILL?
Surviving Spouse and No Lineal Descendants. If there is a surviving spouse and no lineal descendants, the surviving spouse takes all.
Surviving spouse and lineal descendants.
1. If there is a surviving spouse and one or more lineal descendants (with the lineal descendants all being the lineal descendants of the surviving spouse as well as the decedent), the surviving spouse receives the first $20,000 of the probate estate plus one-half of the rest of the probate estate, and the lineal descendants share the remaining half. Beginning January 1, 2002, the $20,000 amount referred to above changes to $60,000.
2. If there is a surviving spouse and one or more lineal descendants (one or more of which lineal descendants are not also lineal descendants of the surviving spouse), the surviving spouse receives one-half of the probate assets and the lineal descendants share the remaining half.
No Surviving Spouse, But Lineal Descendants. If there is no surviving spouse, but there are lineal descendants, the lineal descendants share the estate, which is initially broken into shares at the children's level, with a deceased child's share going to the descendants of that deceased child.
No Surviving Spouse, No Lineal Descendants. If the decedent left no surviving spouse or lineal descendants, the probate property goes to the decedent's surviving parents, and if none, then to the decedent's brothers and sisters and descendants of any deceased brothers or sisters. The law provides for further disposition if the decedent is survived by none of these.
Exceptions to Above. The above provisions are subject to certain exceptions for homestead property, exempt personal property, and a statutory allowance to the surviving spouse and any lineal descendants or ascendants the decedent supported. Regarding homestead, if titled in the decedent's name alone, the surviving spouse receives a life estate in the homestead, with the lineal descendants of the deceased spouse receiving the homestead property upon the death of the surviving spouse. If there are no lineal descendants, the surviving spouse receives full ownership of the homestead outright.
