Get more details if this forum is expected to be more informative. I assume your in-laws are here in OC, not in WA..... ;-)
Otherwise, just call the guy in Huntington Beach I listed earlier.
Local electricians are well aware that SoCal Edison will subsidize an EV charger install up to $800.
So many start their bids at that and go up. Some don't. Depends on which way the wind is blowing.
In general, a Wall Charger (for $550) isn't necessary for a single EV application. Nice, but not necessary.
You just need a 14-50 receptacle installed, then a 14-50 adapter ($45 from Tesla) for the Universal Mobile Charger that comes with the car.
The UMC stays plugged in all the time. The 18ft plug line gets coiled up on a hanger ($16 on Amazon), and then used only when the car needs charging.
Let the electrician recommend the whole GFCI thing that's stirring the pot here. GFCI requirements may influence a need for the WC, or may not.