The landlord, however, can charge a security deposit (but not a separate pet deposit or larger one because of the pet) and may still seek money from the tenant if there is any damage caused by the animal to the home." 

They pay out small interest rates to savings accounts and CD's while charging higher interest rates on loans paid out with other people's money to whom they are paying the lower rates.

Realistic range tends to be 6-8%, depending on neighborhood and whether you're charging market rent.  

The contract shall contain at least the following provisions:(1) The full names and then current mailing addresses of all the parties to the contract; (2) The date when the contract was signed by each party; (3) A legal description of the property conveyed; (4) The contract price of the property conveyed; (5) Any charges or fees for services that are includable in the contract separate from the contract price; (6) The amount of the vendee's down payment; (7) The principal balance owed, which is the sum of the items specified in divisions (A)(4) and (5) of this section less the item specified in division (A)(6) of this section; (8) The amount and due date of each installment payment; (9) The interest rate on the unpaid balance and the method of computing the rate; (10) A statement of any encumbrances against the property conveyed; (11) A statement requiring the vendor to deliver a general warranty deed on completion of the contract, or another deed that is available when the vendor is legally unable to deliver a general warranty deed; (12) A provision that the vendor provide evidence of title in accordance with the prevailing custom in the area in which the property is located; (13) A provision that, if the vendor defaults on any mortgage on the property, the vendee can pay on that mortgage and receive credit on the land installment contract; (14) A provision that the vendor shall cause a copy of the contract to be recorded; (15) A requirement that the vendee be responsible for the payment of taxes, assessments, and other charges against the property from the date of the contract, unless agreed to the contrary; (16) A statement of any pending order of any public agency against the property.

So how much more should I charge since the family has grown plus all the pets?

The problem is if you do not charge and enforce your Late fees etc you are the first person to breach the contract and you are the one that could potentially be putting yourself in legal risk by violating it and not adhering to a legally binding agreement. 

Absolutely get an attorney, go to the DA with a fraud charge as he didn't secure the note as he led you to believe, not just a civil suit but criminal as well.

If no one else wants to do it, sound to me you can charge a premium to do it for others.

It cost me `$100 for the furnace man to inspect and the City charges $75 for their inspector to go out.

it's an easy, easy fix with the right title company and should cost you next to nothing or only 10% of what listsource charges.