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Apple refurbished iPhone 7 Plus. The bigger display will be useful for those with reduced vision.

This without doubt and a decent shock proof case.
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No he hasn't said that he want an iphone, i just believe that it will be easier for him to adapt to it since he is already using nan ipad. What freaks me out is that i will be paying a ton load of money to get him a phone that he will not use its extra high end characteristics whereas i could get him a cheap android phone.

You could get a 6S Plus ptetty cheap though.
 
What would be the best and cheapest iPhone i could get for my dad that doesn't really know anything about the web? He is already using an iPad thats why i want to get an iphone so he isn't gonna have a big learning curve (he already has an Android phone)... unless there's something else around.

Many people use wi-fi internet phone service so he can just use his iPad if he wants as a phone too! Have to have set of earbuds but some can use the iPad speakers as speakers and microphone for voice input.
 
I’d say any standard size iPhone is good for the elderly. It’s not too big to grip like the Plus models and the screen isn’t too small for those with poor eye site like the SE.

iOS means all iPhones essentially look the same from an interface point of view so an iPhone 7 or 8 would be the best option in my humble opinion.
 
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