It will be an issue if you want to use traditional (banking, for example) funding sources.

They were pre-qualified for an $80k manufactured home recently and will have no problems getting a traditional mortgage on the property after repairs have been completed.  

The Probates will mention a probate being open and offer to get "top dollar for property" instead of the traditional investor "fair cash offer as-is".

I don't believe you will be able to find a traditional lender who would approve a scenario where the borrower has none of their own funds in the deal.Is your father going to be putting the money down and applying for the financing in his name?

First, we could sell it with the traditional route. 

Since this wouldn't require traditional underwriting, ie: no mortgage financing involved, are there any restrictions in cash-purchases of real estate where title is conveyed not by a warranty deed but with a quitclaim deed?

Hard money lenders send me (traditional mortgage lender) so much crap in the mail that it must pay off for at least some of them, some of the time.Are you sending craptons of junk mail to traditional mortgage lenders?

I have 2 other investor partners and looking to move my current Traditional IRA to a SDIRA. 

If  a traditional loan is out of the question, you could also seek out private money. 

We net A LOT more than we would doing a traditional rental, but a lot of it was kismet at first, chose the right place at the right time.