You are looking to trench about 8" wide and 1-2 ft deep, install a lining (lining should cove the trench plus flap it back before the top soil), rock bed at the bottom of the trench (3" thick), place filter fabric (non-woven) around the trench and/or pipe, install a perforated pipe (6" at the most), fill with coarse aggregate (no sand or fines since it will clog the perforated pipe), close the materials with a double lap using the fabric, and then the top 4" top soil, etc, and a small outlet somewhere 10 or beyond away from the pavers that provides positive drainage (no water coming back!)  

Once it's at a healthy point focus on flipping.

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San Antonio is a beautiful city and has a very healthy real estate market...

As long as he is not wasting money on rent, staving up another year and figuring out how to earn more money might be a healthy thing! 

So they move as the soil moves.

My guess is that drought conditions for last 3-4 yrs have caused the soil to move and that's why the foundation seems to have moved.

Sometimes it means installing piers *underneath* the foundation, which are usually long enough to go through unstable soil and either hit rock or more solid soil. 

This is caused by soil settling and is a common issue with pier and beam houses.

Hope everyone is doing well and all your families are healthy during these unprecedented times.