In my humble opinion, to give you a few tips:
①As for the choice of what things, in fact, is not dependent on you, but depends on your elders what he needs, you can recall the elders of the mouth from time to time to bring up what things are good to bring up something is not the kind of thing that can be viewed from afar, it must be practical, and is something that he likes.
②For older elders, the most important thing now is to be healthy and happy every day. For the health level you can think about from the warmth of the equipment, nutrition; for the happy level you can make some "spiritual products", such as family set, if you can buy the kind of square dancing equipment to play music, or radio, this kind of thing for the elderly is in front of other people's talk, to get the spirit of fulfillment is far more than the cold some material to stick. Cold material to the heart, to the temperature.
The above can take into account your not expensive and practical, action, teenagers! Welcome to follow-up exchanges!