His daughters have just started going through his things and throwing stuff out.  

Oldest daughter is 19 and goes to college.  

There are attorneys that specialize in quiet title for tax deed sales like Hicks/Knight from Tampa.They can get one done in around 60 days, then you wait for the appeal, and at the end of the wait period you have clear title.In my example, I sold to a neighbor who was buying the house for his daughter on a quit claim deed, fully disclosed, and he did the quiet title.

The other issue is the owner's daughter still lives in the house.

My wife and daughter and I I are moving to San Diego area.

Out of the 8 people that I have visited 2 have been listed with a real estate agent. 4 were vacant. 1 person answered the door but the owner will return on the date of the foreclosure. 1 daughter answered. 

My daughter's name is Jane. :)

I went to whitepages.com or beenverified.com (can't remember which one) and paid like 3$ for a full report on the daughter I suspected of being in charge.

Is the realtor your best friend’s nephew’s daughter’s mom recommended getting frustrated with your multiple low ball offers?

Note : We did rent to daughter but his dad only listed as occupied list, we only screened the daughter who the one sign the lease.