Well, we might get away with a two seater but to be honest, I've got attached to the idea of the fourseater now. I prefer the older ones without the easy-up hood. They look less bulky open and have that "so ugly its cute" look when the hood is up (my take on it but no offence intended).
As regards getting in and out of the car. I fear my wife may struggle to get out - for instance she doesn't like to use a sunbed in the garden now because of the difficulty of getting up from the low sitting position, maybe in a similar way to your mother John?
Best wishes