After talking to another family member they said they would be willing to go in on the duplex and offered to pay the $40,000 down payment and help with any repairs but they want to be "partners" or "own" a percentage of the duplex.

Now, moving forward he offered for us to take it over completely.

A few others have called out Hemlane, who appear also quite responsive here on BP and also offer a degree of repair/work order management baked right into their middle/upper tier offerings (versus having to bolt-on as with RentRedi + Latchel). 

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. 

Take time to learn through military-focused resources like Military House Hacking or Active Duty Passive Income, and connect with other military investors online or on base.

Does any of your competition offer it all? 

This community will offer you so much value - don't be afraid to drop your questions here or reach out to any of the folks above directly.

New to the app & doing some research, I found this app might be a good resource.  

Why can't you offer her assistance while she trains you, so you both make money?

Here to be a resource.