For this, after staying away from cans of coke - Brio, March, Mirage, not much difference given your needs. Yaris, Jazz, Swift, look at the interior size (will there be wheelchairs involved and him being lifted in and out?), the ease of servicing (which dealership is closest?)
I was gonna say resale value, but if you think she's gonna sell the car and give you the money once he passes on you might be surprised.

If selling it and getting your money back after that event do leasing or long term rental.