The statute requires that the outstanding rent be paid to the court registry. The attorney can hold the money in the registry and file a notice with the court stating that the attorney has the money in trust, but the court is not obligated to treat it as if the money was deposited into the court registry.
Consult an attorney as soon as possible. If the attorney confirms that title is still in your name, then you don't need the mortgage company to give you the keys. You can get a locksmith to change the locks and you take possession of your home. If someone is living there you may have to file an unlawful detainer action to get them out.
Florida makes the owner of a car liable for injuries resulting from its use. So in addition to purchasing adequate insurance, the car should probably be titled in the daughter's name and keep your name off to limit liability.
Whether you can raise the rent or make a new lease depends on the terms of your current lease. You may have to wait until the lease ends and then change the rent terms if they want to renew. Talk to a landlord-tenant attorney about drafting a new lease so that you can rent the units separately and address the separate units.
When the tenant is resisting your efforts in that manner i don't recommend showing the property. You can serve a three day notice and then file an eviction action or wait for the lease to end then file your eviction but you probably need to evict the tenant. If they have not paid in two months they may be planning on staying as long as they can.
Consider placing a sign in the rear window that states "Tag stolen" and list your current tag number, also state that a replacement has been ordered. That should put them on notice that your car is not abandoned and that the car is registered.
Be sure to file a response within the time period. What you should include will depend on the allegations in the complaint. Do not write a letter explaining the hardship you are going through and expect the court to be lenient. The court gets that sort of letter all the time and it does not serve as a denial of the lender's claims. A better choice is to contact a consumer lawyer for a consultation and determine what defenses you may have. In Dade City you could try contacting Mike Wasylik, Esq.
A fifteen month lease is greater than one year and the lease must be signed by the landlord in the presence of two witnesses. A lease for more than one year is to be executed with the formality of a deed. If they did not follow procedure, you may be able to successfully argue that the lease is only a month-to-month lease. Have an attorney review the document to determine if you have that argument.