Times are really changing. Years ago, we see the elderly, our grandparents for example, playing solitaire for hours on end to while away the time, since most of them have nothing else to do, or have family members that do not pay much attention or do not devote enough time to them. Some do not have fully-functioning faculties of hearing or speech anymore that is why they find it hard to communicate with the people around them and would rather be entertained playing solitaire. If your folks are still good in terms of eyesight and also in hand coordination, you can try to entertain them by teaching them card games that they can play on the web. There are many variations of free card games, even of solitaire alone, which you can find when you browse the internet. There are many versions of cards solitaire like Fortune Solitaire, Flower Garden Solitaire, Crescent Solitaire and hundreds of other variations which your old folks can enjoy so much.
If your grandparents or even parents are not that old yet, maybe newly retired from work and eager to find activities online, you can also recommend sports games that they can definitely enjoy. These online games indeed have many variations, and come with superb graphics as well.