I wish I could have one same habbit with my father. I envy you a little bit on that.
Please do buy the Camara for your father. It is rarely for father and son to have one same interest in mind. I do believe you and your father would have a lot of good time talking about photos you guys take.
Me and my father used to play golf together and we had a good time together but not any more ever since he has problem with his back spine. So, if your father loves taking pictures then let him be and please do spend sometime with him and I am sure any camara you buy for him is worth and even you might think cheap. Think about that, how much would you pay for your father to be happy? A camara is nothing compared to quality time you have with your father.
Good job for you. I like how you being considerate for your father. Wish I could be a good son like you.