My mum, and step mum, haven't touched their laptops since I bought them iPads. Neither were tech savvy and both in their 70's, won't put the bloody things down now... give them a few mins playing with one and they will be sold.
I'd be thinking of a chromebook to be honest. Nice and easy to use, pretty much impossible to screw up and if you do it's a matter of a couple of minutes to reset.
So the iPad has a keyboard...great.
How is the lack of track pad / mouse? Is this something I could persuade my parents they don't need?