You don't state which model that you drive.
The round trip from Tejon Ranch to Bakersfield is maybe 60 miles give or take. You can add 60 miles of range over a 12-hour charging session from a 120V/15A wall plug. There is also a cluster of J-1772 chargers listed on PlugShare in the downtown area that are offered through ChargePoint. There are fees associated with these chargers. Those will provide about 6+kW. Three hours at one of those plugs will add close to 20kWh to your battery.
In other words, unless you plan on doing a lot of driving during your visit with your folks, I believe if you leave Tejon Ranch with 90%, you should be able to depart with no less than 35%, which is an easy drive back to the Supercharger at Tejon Ranch.