Seems to be a thing of the past to have a built in HDD. LG32LT5 sounds like what you wanted but nowhere seems to have any in stock.
All modern TVs will record and play back from the USB socket but only the channel you are watching - ok if late at night or you are out but not if you want to watch another channel at the same time.
To record something, while watching something else, needs a twin tuner.
I run my old Humax box through a Technika TV, set to scart input. TV remote to switch on and control volume Humax remote for everything else.
However if elderly that's confusing, my mother struggles with more than 4 channels:0)