I currently have a plug-in hybrid and I'm about to trade in for full electric. The plug-in hybrid has been pretty good, I've had it for 2 yrs and 4 months and I've done just over 20k km, of which 17k km was using the electric motor since most of my journeys are short and local. I only need to put half a tank of petrol in every 3 or 4 months. I am the type to always remember to plug it in every single time I come home, if you're forgetful or easily distracted then there's no point going plug-in hybrid. Also, the handling is noticeably heavier when it switches over to petrol, the electric is much more fun to drive.
A few things to consider. The official range that car companies give for their cars is absolute la-la land, you will never get anywhere near that especially when it's cold or you're doing motorway driving. My longest journey is 220km and my new car will have an official range of 480km, I need my range to be more than twice my journey to be sure of getting there. So, a return trip to your parents is 80 miles, you would need a range of around 180-200 miles to avoid range anxiety.
Also, you will need to have a cheap night rate to maximise your savings, if you charge during the day you won't save as much and if you charge at a public charger you might even end up paying almost as much per mile as petrol would be.
You would preferably need a long battery warranty, my new car will have an 8 year warranty which stays with the car not the owner, so anyone who buys my new car second-hand in a few years will still have the warranty.
You need enough space on your driveway for the electric car to be always near the charger, it would be a pain to constantly need to move your DH's car if him getting home before you means that you can't reach the charger (although you can buy a longer cable if needed, I have a 10m one).