If you really want to get rid of them, sweeten the pot by offering to return their deposit after you verify the unit is empty with no damages. 

So I get 15-20 leads for each booking on Furnished Finder, which is a PITA because of all the manual follow-up and manual paperwork required vs AirBnB and others with instant booking and streamlined tenant approvals/p...

You looked past a red flag right at the outset:"When application was made tenant was I am not going to to have my puppy with me so do not need pet fee or application"Total red flag.

You can be sure they will continue to negotiate for, strategize and advise themselves.If the laws are similar where you are, you should consider if you want someone doing those things for you, and whether you are comfortable going toe-to-toe alone with a licensed professional on a $1.25 million purchase.

There's more nuance to to it for sure but this is a good overview.

I work at my brothers business as a independent contractor ,  he has an accountant for this business is necessary for him to to this job or i can do it myself.

@Jared W SmithThe words trust but verify ring very true with those stories.

Since you have verified this couple owns the property, you are good there. 

.- Collect Tax Certificate to verify Property Taxes are Paid- Get a current statement from the seller to verify the existing balance, if they are delinquent, you can get the bank on the phone to verify the amount to make the loan current.- Review the loan documents, there is most likely a due on sale clause, which is why you won't find a title company to process these for you.

The other info sounds great but I would verify the assumptions I mentioned because if they’re off, it throws everything else off.