OK.. there is one product that I think is 100% suited in this situation..
The Logitech Harmony Range..
The only proviso is that you need internet access when setting it up, since all device settings are held online..
But assuming your dad has access, or you do, then this product is probably the best solution..
I'd recommend the Logitech Harmony 525, this is around £50.
The reason they are very very suitable for people who find it all too complicated, is that they use what is termed 'Activity based' control..
Basically, when setting the remote up, you give it a list of all your equipment, then you start setting up activities, such as "Watch a DVD", or "Watch TV", "Record TV"..
For each activity, the setup software leads you through setting it up with easy to understand questions such as "Which device will display the picture for this activity", and "What input does this device need to be on", with drop down menus that are relevant to each device.. it also asks you what to do with devices not being used (i.e. turn them off or leave them)..
This has many advantages, as it 'knows' what state it is currently in, if you change activity, it just does the minimum it needs to do..
It has one stand-by button that turns everything off, and if it gets a bit out of sequence, it has a help button on the remote that will lead you through problem solving it, with questions such as "Is the TV on?" and "Is it on Input 1?" until the sequence is restored..
The setup of the device is very flexible, and you can reassign buttons, etc, and all the usual stuff..
You can also manually control any device, by pressing the 'DEVICES' button and selecting the device on the remote..
It's not perfect, and does rely on you letting it put the devices in and out of standby, and not turning them off at the plug, if your dad switches everything off overnight by the plugs, then it will no doubt get out of sequence regularly and he'd have to use the help all the time.. but left to do the controlling of it all, and it should rarely go wrong..
I've had universal remotes for ages, spent months setting up my Pronto, but always found the missus struggled with it.. I spent an hour setting up the Harmony, and the missus just picked it up straight away..