Her mom did not put her daughter on the deed before her passing, now a claim has been filed against her mother’s estate.

You can get advice on business practices and customs, but not law.When it comes to docs, USE A LAWYER. 

Can we claim the duplex as our primary residence if it is fully rented out and we are traveling?

@Aaron Vargas You could consider purchasing the property individually and then quit claiming the property into the LLC. 

I have seller and buyer agreements sent to my title company, they told me I need to show evidence to extinguish about 4 interest on the property(which are quit claim)And a mutual release of my sellers previous purchase agreement which he doesn’t have nor remember.

Doing direct mail, SEO your website and a handful of other resources can get you deals.Wholesalers (or those who claim to be) are a dime a dozen, it took several years to get my inbox from receiving so many of them.

If you're not in a rush for the money Quit Claim Deed back into your name, let it season for 6 months then refinance with the better rates ...

However, you have a legitimate claim for 1/2 of the deposit since that is your actual losses.

@Matt Wells hope you don't mind me replying here but you can be added to title at any time. in most states you use a "warranty deed" or a "quit claim deed" to add (or subtract) people from the title/ownership of a home.  

Hopefully everyone had insurance and if you did you need to be very aggressive with filing and staying on top of your claims.