Is it as simple as contract the new home with a move in date within 30 days, and write the lease back agreement with the current owners separately therefore leaving it still as a primary residence? 

This doesn’t need to be too expensive or complicated, simple touches like decluttering, rearranging furniture, and adding tasteful décor can create an inviting atmosphere.Invest in professional photography to showcase the property online, as captivating images can attract more potential buyers.

BTW, it's not a "theory" but simple math and what the truly wealthy do all over the world.

If you are able to succeed at this, you could make a lot of money in 10-12 after holding these properties.The formula is simple.

If out of state, try to find one that has people that can fix simple things in your investment on their staff. 

I ended up going with BIFI ... unsure why ... but so far - the onboarding was very simple and - again, so far so good.   

Had good luck with Aven and certain things with that HELOC were very simple.

If mom is going to live there too, it is simple they are both on the lease.

This answer is simple, yet elegant. 

Since you are in NC, historically I would think a simple broker's option contract would work.