Without knowing all the details,
I would suggest that you speak with an attorney familiar with local estate law regarding the possibility of issues involving the estate of your in-laws and the matter of Wills, beneficiaries, executor/executrix and a testamentary trustee who may have been appointed or if they both died intestate, which one died first, etc
If they died intestate, then an application by a relative for an appointment as an estate administrator may be required with the posting of a bond.
There may be other issue, such as
_Who’s name shows on title to the property and the mobile home?
_Were the 2 lots legally severed into two separate lots?
_Certified copies of the death certificates, the will and letters of probate may be required to effect a transfer of title.
_Do the 5 siblings have any inheritance rights against the estate of your in-laws?
IMPORTANT NOTICE: This information is provided as basic educational information by the author and is not a substitute for the advice of an expert and/or the advice of a Lawyer. There is NO representation as to legality, accuracy, correctness of the herein information and the reader is strongly urged to consult a lawyer in the relevant jurisdiction to ensure accuracy before acting on this information.